RESEARCH PUBLICATIONS
1.
P. D. Siafarikas, Analytic
solutions of singular Linear differential Equations and Applications, Ph. D. Thesis (in Greek), University of Patras,
(1980) Patras, Greece.
2.
Jannussis, L. Papaloukas, and P.
D. Siafarikas, Eigenfuctions and Eigenvalues of
the Differential Operators, Hadronic
Journal Vol. 3 (1980), 1622-1632, MR 82g 81029 (R. C. Cilbert),
ZM 447, 47027.
3.
Jannussis, G. Brodimas, D. Sourlas, L. Papaloukas, P. Poulopoulos, and P. D. Siafarikas,
Generalized q-Bose Operators, Letter. Nuovo Cimento Vol. 34 (12), (1982), 375 - 379, MR 83M 81046
(F. R. Helbern).
4.
Jannussis, G. Brodimas, D. Sourlas, A. Streklas, P. Siafarikas, L. Papaloukas and
N.Tsangas, Foundations of Lie-Admissible Fock space of the Hadronic
Mechanics, Hadronic
Journal Vol. 5 (1982), 1923-1947 MRb 81049 (Jean Fronteau), ZM 514. 17008.
5.
P. D. Siafarikas, A Singular
Functional-Differential Equation, Intern.
Journ. Math. Maths. Sciences Vol. 5 (1982),
497-501. MR3 34086, (Author's Summary) ZM 488,34057.
6.
P. D. Siafarikas, A Lower Bound for
the zeros of Ordinary Bessel functions, Proceedings of VI Balkaniade of Young researchers (1982)
7.
P. D. Siafarikas, A. Jannussis, G. Brodimas, L. Papaloukas, q-Algebra without Interaction, Letter. Nuovo Cimento Vol. 37 (1983),
119-123, MR 84 81082 (A. Barut).
8.
A. Jannussis, G. Brodimas, D. Sourlas, K. Vlachos, P. D. Siafarikas
and L. Papaloucas, Some properties of
q-Analysis and Applications to non-canonical Mechanics, Hadronic Journal Vol. 6 (1983)
1653-1686, MR 85b 70021 (P. Achuthan) ZM. 557 70027.
9.
P. D. Siafarikas, Conditions
for Analytic Solutions of a Singular Differential Equation, Applicable Analysis Vol. 17 (1983), I-12, MR 86 34012
(Editors), ZM 501, 34048.
10.
A. Jannussis,
G. Karayannis, P. Panagopoulos, V. Papatheou, M. Symeonidis, D. Vavougios, P.Siafarikas
and V. Zisis, Exactly Soluble
Harmonic Oscillator for a Particular Form of Time and Coordinates-Dependent
Mass, Journal of the Physical Society of Japan
Vol. 53 (3) (1984), 957 - 962.
11.
A. Jannussis,
P. Filippakis, V. Papatheou,
A. Leodaris, P. Siafarikas,
V. Zisis and N. Tsangas, Damped and
Coupled Oscillators, Hadronic
Journal Vol. 7 (1984), 1515 - 1534.
12.
E. K. Ifantis,
P. D. Siafarikas and C. B. Kouris,
Conditions for Solutions of a Linear First Order Differential Equation in the
Hardy Lebesgue space and Applications, Math. Anal. Appl. Vol. 104(1984),
454-466 MR 86 34007 (R. Gerard), ZM 558, 34006. Referativnii J. Math. 7b174 (M. FEDOPHOK).
13.
P. D. Siafarikas, An Operator Inequality, Inter.
Journ. Math. Maths. Sciences Vol. 7 (1984)
205-207, MR 47003 (Gerhard Garske).
14.
P. D. Siafarikas, On the number of analytic solutions of a Singular Differential System, Complex Variables Vol. 4 (1984) 49-56, MR 86 34012 (William
Noble)ZM 517, 30031.
15.
E. K. Ifantis
and P. D. Siafarikas, An Inequality related the zeros of two Ordinary
Bessel Functions, Applicable Analysis
Vol. 19 (1985) 251-263. MR 86 33009 (A. Laforgia), ZM 544, 33008.
16.
E. K. Ifantis
and P. D. Siafarikas, A Differential Equation
for the zeros of Bessel Functions, Applicable
Analysis Vol. 20 (1985), 269-281, MR 87 33017 (M. E. Muldoon), ZM 553. 33004.
17.
E. K. Ifantis
and P. D. Siafarikas, Ordering relations
between the zeros of Miscellanous Bessel Functions, Applicable Analysis Vol. 23 (1986), 85 -110, MR 87M 33005 (M.E.
Muldoon).
18.
E. K. Ifantis
and P. D. Siafarikas, A functional analytic
approach for the study of the zeros of Bessel functions, Linear Algebra
Applications Vol. 84 ( 1986), 391-397.
19.
E. K. Ifantis,
P. D. Siafarikas and C. B. Kouris,
Upper Bounds for the first zeros of Bessel Functions, J. Comp. Appl. Math. Vol. 17(1987), 355-358, CMP 19(10), 1987.
20.
P. D. Siafarikas, On the Conjugate equation of a Singular Differential operator, Bullet. Greek. Math. Soc. Vol. 28 (1987A), 103-109, MR 89c
34010 (Marian Muresan).
21.
E. K. Ifantis
and P. D. Siafarikas, A Differential Equation
for the positive zeros of the function aJí(z)+zJí'(z), Zeitsc: Anal. Anwend.
(ZAA) Vol. 7 (2) (1988), 185-192. MR 89h 33009
(M.E. Muldoon).
22.
E. K. Ifantis
and P. D. Siafarikas, Bounds for the first
positive zero of a Mixed Bessel function, J.
Comp. Appl. Math. Vol. 21 (1988), 245-249, MR 89i 33010 (Boro Doring).
1.
E. K. Ifantis,
P. D. Siafarikas and C. B. Kouris,
The imaginary zeros of a Mixed Bessel Function, J. Appl. Math. Phys. (ZAMP) Vol. 39
(1988), 157-165. MR 89d 33012 (M.E. Muldoon).
2.
E. K. Ifantis
and P. D. Siafarikas, Differential
Inequalities on the greatest zero of Laguerre and Ultraspherical polynomials, Actas del VI Simposium,
Gijon, Spain (1989), 187-197.
3.
E. K. Ifantis
and P. D. Siafarikas, Inequalities
Involving Bessel and Modified Bessel Functions, J. Math. Anal. Appl. Vol. 147 (1990), 214-227. Referativnii J. 9b15 (1991) (C. Ckopoxodob).
4.
E. K. Ifantis
and P. D. Siafarikas, Differential
Inequalities for the positive zeros of Bessel Functions, J. Comp. Appl. Math. Vol. 30 (1990) 139-143.
5.
E. K. Ifantis
and P. D. Siafarikas, A result on the
imaginary zeros of Jí''(z), Jour. Approx.
Theory Vol. 62 (1990) 192-196. V Referativnii J. 1B17(1991) (C.CkopoxoDob).
6.
C. G. Kokologianaki,
and P. D. Siafarikas, Non existence of
complex and purely imaginary zeros of a Transcendental Equations Involving
Bessel Functions, Zeitsc.
Anal. Anwend. (ZAA)
Vol. 10, (1991), 563-567.
7.
E. K. Ifantis
and P. D. Siafarikas, Bounds of Modified
Bessel Functions, Rendic.
Circolo. Math.
8.
A. Laforgia
and P. D. Siafarikas, Inequalities for the
zeros of Ultraspherical Polynomials, in Orthogonal Polynomials and their applications, C. Brezinski et aIl
(Editors) IMACS, (1991), 327-330.
9.
A. Elbert and P. D. Siafarikas, On the zeros of aCí(x)+xCí'(x) where Cí(x) is a Cylinder Bessel Function, J. Math. Anal. Appl. Vol. 164 (1992), 21-33.
10.
C. G. Kokologianaki,
P. D. Siafarikas and C. B. Kouris,
On the complex zeros of Hì(z), Jì'(z), Jì''(z) for real or
complex order, J. Comp. Appl. Math.
Vol. 40 ( 1992), 337-334.
11.
E. K. Ifantis
and P. D. Siafarikas, A Differential Inequality for the Positive
zeros of Bessel functions, J. Comp. Appl.
Math. Vol. 44 (1992), 115-120.
12.
E. K. Ifantis
and P. D. Siafarikas, On the zeros of a class
of Polynomials Including the generalized Bessel Polynomials, open problem, J.
Comput. Appl. Math. Vol. 48 (1993) 237-239.
13.
E. K. Ifantis
and P. D. Siafarikas, On the zeros of a
class of Polynomials Including the generalized Bessel Polynomials, J. Comp. Appl. Math. Vol. 49 (1993), 103-109.
14.
E. K.Ifantis,
P. D. Siafarikas and A. D. Jannussis,
Entire solutions of a second order Linear Differential Equation, Complex Variables Vol. 22 (1993), 23-26.
15.
C. G. Kokologiannaki,
P. D. Siafarikas, An Alternative proof
of the monotonicity of jí,1'', Vol. 1, Bollettino U.M.I. Vol. 7-A (1993), 373-376.
16.
C. G. Kokologiannaki,
M. E. Muldoon, P. D. Siafarikas, A Unimodal Property of Purely Imaginary zero of Bessel and
related functions, Canad.
Math. Bull. Vol. 37 (3) (1994), 365-373.
17.
E. K. Ifantis
and P. D. Siafarikas, Perturbation of the
coefficients in the recurrence relation of a class of polynomials, J. Comp. Appl. Math. Vol. 57 (1995), 163-170.
18.
E. K. Ifantis
and P. D. Siafarikas, Differential
Inequalities and Monotonicity Properties of the zeros
of Associated Languerre and Hermite
Polynomials, Ann. Numer. Math. Vol. 2 (1995), 79-91.
19.
P. D. Siafarikas, A note on the Generating Functions, Bullet.
Greek Math. Soc. Vol. 36 (1995), 93-96.
20.
E. K. Ifantis
and P. D. Siafarikas, An Alternative Proof of a Theorem of Stieltjes and related results, J. Comp. Appl. Math. Vol. 65 (1995), 165-172.
21.
C. G. Kokologiannaki
and P. D. Siafarikas, Convexity of the
largest zero of the Ultraspherical Polynomials, Integral Transforms and Special functions Vol. 4 (3) (1996),
275-278.
22.
E. K. Ifantis,
C. G. Kokologiannaki and P. D. Siafarikas,
Newton Sum rules and Monotonicity Properties
of the Zeros of Scaled co-recursive Associated Polynomials, Meth. Appl. Anal. Vol. 3(4) (1996), 486-497.
23.
P. D. Siafarikas,
On the zeros of the
associated ultraspherical polynomials, In: Funzioni Speciali e Applicazioni, Edts A. Bellacicco and A. Laforgia, FrancoAngeli, S.r.l. Milano,
Italy, (1998).
24.
A. Elbert and P. D. Siafarikas, Monotonicity Properties of the zeros of Ultraspherical Polynomials, J. Approx. Theory Vol. 97 (1999), 31-39.
25.
A. Elbert and P. D. Siafarikas, On the square of the first zero of Bessel
functions, Canad.
Math. Bulletin Vol. 42 (1) (1999), 56 - 67.
26.
P. D. Siafarikas, Inequalities for the zeros of the associated Ultraspherical
Polynomials, Math. Inequal. and Applications Vol.
2 (2) (1999), 233-241.
27.
E. N. Petropoulou
and P. D. Siafarikas, Bounded solutions and
asymptotic stability of nonlinear difference equations in the complex plane, Archivum Mathematicum
(Brno) Vol. 36 (2) (2000), 139-158.
28.
E. N. Petropoulou
and P. D. Siafarikas, Bounded solutions and
asymptotic stability of nonlinear difference equations in the complex plane II, Computers and Mathematics with Applications (Special Issue:
Advances in Difference equations III) 42 (3-5) (2001), 427-452.
29.
E. N. Petropoulou
and P. D. Siafarikas, Bounded
solutions of a class of linear delay and advanced partial difference equations,
Dynamic Systems and Applications, 10 (2) (2001), 243-260.
30.
A. Elbert, A. Laforgia and P. D. Siafarikas,
A conjecture on the zeros of ultraspherical
polynomials, Open Problem, J. Comp. Appl. Math. (Special Issue:
Orthogonal Polynomials, Special Functions and their Applications), 133 (1-2)
(2001), 684-686.
31.
P. D. Siafarikas, Finding a measure of orthogonality, Open Problem, J. Comp. Appl. Math. (Special Issue:
Orthogonal Polynomials, Special Functions and their Applications), 133 (1-2)
(2001), 697-699.
32.
E. K. Ifantis,
P. D. Siafarikas, A counterexample
to an assertion due to Blumenthal. Univ. Iagel. Acta Math. Vol.. 39 (2001),
249-254.
33.
E. J. Ifantis,
C. G. Kokologiannaki and P. D. Siafarikas,
On the support of the measure of orthogonality
of a class of orthogonal polynomials, Applied
Mathematics and Computation Vol. 128 (2-3) (2002),
275-288.
34.
A. Laforgia,
M. Muldoon and P. D. Siafarikas, Arpad Elbert,
1393-2001: a memorial tribute, J. Comput. Appl. Math. Vol. 153 (2003), 1-8.
35.
E. N. Petropoulou,
P. D. Siafarikas and I. D. Stabolas,
On the common zeros of Bessel
functions, J. Comput. Appl. Math. Vol. 153 (2003), 387-393.
36.
E. N. Petropoulou
and P. D. Siafarikas, Existence
and uniqueness of solutions in H1(Ä) of a general class of non-linear functional equations, J.
Math. Anal. Appl. Vol. 279 (2) (2003), 452-463.
37.
E. N. Petropoulou
and P. D. Siafarikas, Solutions
of non-linear delay and advanced partial difference equations in the space l1NxN,
Computers and Mathematics with Applications (Special Issue: Advances in
Difference equations IV), Vol. 45 (2003), 905-934.
38.
E. N. Petropoulou and P. D. Siafarikas, A functional-analytic
method for the study of difference equations, Adv. Differ. Equat. 2004:3 (2004), 237-248.
39.
E. N. Petropoulou
and P. D. Siafarikas, Analytic
solutions of some non-linear ordinary differential equations, Dynam. Systems Appl. 13 (2004), 283-316.
40. C. G. Kokologiannaki, P. D. Siafarikas, I. D. Stabolas, Monotonicity properties and
inequalities of the zeros of q-associated polynomials, Nonlinear analysis and applications: to V. Lakshmikantham on his 80th birthday. Vol. 1, 2, 671--726, Kluwer Acad. Publ.,
41.
E. N. Petropoulou and P. D. Siafarikas, Existence of complex l2
solutions of linear delay systems of difference equations, J. Differ. Equat. Appl. 11 (2005), no.
1, 49-62.
42.
E. N. Petropoulou, P. D. Siafarikas and I. D. Stabolas,
Convexity results for the largest zero and functions
involving the largest zero of $q-$ associated polynomials, Integral
Transform. Spec. Funct., 16 (2005), no.
2, 171-178.
43.
P. D. Siafarikas, I. D. Stabolas and L.
Velazquez, Differential inequalities of functions involving
the lowest zero of some associated
orthogonal q-polynomials, Integral Transform. Spec. Funct.,
16 (2005), no.
4, 337-376.
44.
E. N. Petropoulou
and P. D. Siafarikas, Analytic
solutions of the Painleve equations, Commun. Appl. Anal. 9 (3) (2005), 1-18.
45.
C. G. Kokologiannaki, P. D. Siafarikas
and I. D. Stabolas,
46.
E. N. Petropoulou and P. D. Siafarikas,
Analytic
bounded travelling wave solutions of some nonlinear equations, Chaos, Solitons and Fractals 33 (2007), 94-108.
47.
E. N. Petropoulou, P. D. Siafarikas
and E. E. Tzirtzilakis, A ``discretization" technique for the solution of ODEs, J. Math. Anal. Appl. 331 (2007) 279–296.
48.
E. N. Petropoulou and P. D. Siafarikas,
Polynomial solutions of linear
partial differential equations, Commun. Pure Appl. Anal. 8 (3) (2009)
1053-1065.
49.
E. N. Petropoulou, P. D. Siafarikas, I.D. Stabolas, Analytic bounded travelling wave solutions of some nonlinear
equations II, Chaos, Solitons and Fractals, 41 (2009), 803-810.
50.
E. N. Petropoulou, P. D. Siafarikas
and E. E. Tzirtzilakis, A ``discretization" technique
for the solution of ODEs II, Numer.
Funct. Anal. Optim. 30
(5-6) (2009) 613-631.