O. Ragos homepage : Publications

Publications in journals :

1. O. Ragos and C. Zagouras : "The zero velocity surfaces in the photogravitational restricted three-body problem",
   1988, Earth, Moon, and Planets, 41, pp.257-278.

2. O. Ragos and C. Zagouras : "Periodic solutions about the `out of plane' equilibrium points in the photogravitational restricted three-body problem",
   1988, Celestial Mechanics, 44, pp.135-154.

3. O. Ragos, C.G. Zagouras and E. Perdios : "Periodic motion around stable collinear equilibrium point in the photogravitational restricted problem of three bodies",
   1991, Astrophysics and Space Science, 182, pp.313-336.

4. O. Ragos and C. Zagouras : "Periodic solutions around the collinear Lagrangian points in the photogravitational restricted three-body problem : Sun-Jupiter case",
   1991, Celestial Mechanics, 50, pp.325-347.

5. E. Perdios, C.G. Zagouras and O. Ragos : "Three-dimensional bifurcations of periodic solutions around the triangular equilibrium points of the restricted three-body problem",
   1991, Celestial Mechanics and Dynamical Astronomy, 51, pp.349-362.

6. O. Ragos and C.G. Zagouras : "On the existence of the `out of plane' equilibrium points in the the photogravitational restricted three-body problem",
   1993, Astrophysics and Space Science, 209, pp.267-271.

7. O. Ragos and F.A. Zafiropoulos : "A numerical study of the influence of the Poynting-Robertson effect on the equilibrium points of the photogravitational restricted three-body problem : I. Coplanar case",
   1995, Astronony and Astrophysics, 300, pp.568-578.

8. O. Ragos and F.A. Zafiropoulos and M.N. Vrahatis : "A numerical study of the influence of the Poynting-Robertson effect on the equilibrium points of the photogravitational restricted three-body problem : II. Out of plane case",
   1995, Astronony and Astrophysics, 300, pp.579-590.

9. M.N. Vrahatis, O. Ragos, T. Skiniotis, F.A. Zafiropoulos and T.N. Grapsa : "RFSFNS: A portable package for the numerical determination of the number and the calculation of roots of Bessel functions",
   1995, Computer Physics Communications, 92, pp.252-266.

10. L. Drossos, O. Ragos, M.N. Vrahatis and T. Bountis : "Method for computing long periodic orbits of dynamical systems",
    1995, Physical Review E, 53(1), pp.1206-1211.

11. M.N. Vrahatis, O. Ragos, F.A. Zafiropoulos and T.N. Grapsa : "Locating and computing zeros of Airy functions",
    1996, Zeitschrift fur Angewandte Mathematik und Mechanik, 76, pp.419-422.

12. M.N. Vrahatis, T.N. Grapsa, O. Ragos and F.A. Zafiropoulos : "On the localization and computation of zeros of Bessel functions",
    1996, Zeitschrift fur Angewandte Mathematik und Mechanik, 77(6), pp.467-475.

13. C.G. Zagouras, E.Perdios and O. Ragos : "New kinds of asymmetric periodic orbits in the restriced three-body problem",
    1996, Astrophysics and Space Science, 240, pp.273-293.

14. M.N. Vrahatis, O. Ragos, T. Skiniotis, F.A. Zafiropoulos and T.N. Grapsa : "The topological degree theory for the localization and computation of complex zeros of Bessel functions",
    1996, Numerical Functional Analysis and Optimization, 18(1&2) , pp.227-234.

15. O. Ragos, K.E. Papadakis and C.G. Zagouras : "Stability regions and quasi-periodic motion in the vicinity of triangular equilibrium points",
    1997, Celestial Mechanics and Dynamical Astronomy, 67, pp.251-274.

16. P. Kravanja, O. Ragos, M.N. Vrahatis, and F.A. Zafiropoulos : "ZEBEC: A mathematical software package for computing zeros of Bessel functions of real order and complex argument",
    1998, Computer Physics Communications, 113, pp.220-238.

17. P. Kravanja, M. Van Barel, O. Ragos, M.N. Vrahatis, and F.A. Zafiropoulos : "ZEAL: A mathematical software package for computing zeros of analytic functions",
    2000, Computer Physics Communications, 124, pp.212-232.

18. V.S. Kalantonis, E.A. Perdios, A.E. Perdiou, O. Ragos, and M.N. Vrahatis : "On the application of optimization methods to the determination of members of families of periodic solutions",
    2003, Astrophysics and Space Science, 288(4), pp.581-590.

19. V.S. Kalantonis, E.A. Perdios, A.E. Perdiou, O. Ragos, and M.N. Vrahatis : "Deflation techniques for the determination of periodic solutions of a certain period",
    2003, Astrophysics and Space Science, 288(4), pp.591-599.

20. E.A. Perdios and O. Ragos : "Asymptotic and periodic motion around collinear equilibria in the Chermnykh's problem",
    2004, Astronomy and Astrophysics, 414, pp.361-371.

21. V.S. Kalantonis, E.A. Perdios and O. Ragos : "Asymptotic and periodic motion around L_3 in the photogravitational restricted three-body problem",
    2006, Astrophysics and Space Science, 301(1), pp.157-165.

22. K. Papadakis, O. Ragos and C. Litzerinos, : "Asymmetric periodic orbits in the photogravitational Copenhagen problem",
    2009, Journal of Computational and Applied Mathematics, 227, pp.102-114.

23. I. Haranas and O. Ragos : "Yukawa-type potential effects in satellite dynamics",
    2011, Astrophysics and Space Science, 331(1), pp.115-119.

24. I. Haranas, O. Ragos and V. Mioc : "Yukawa-type potential effects in the anomalistic period of celestial bodies",
    2011, Astrophysics and Space Science, 332(1), pp.107-113.

25. I. Haranas and O. Ragos : "Calculation of radar signal delays in the vicinity of the Sun due to the contribution of a Yukawa correction term in the gravitational potential",
    2011, Astrophysics and Space Science, 334(1), pp.71-74.

26. I. Haranas, O. Ragos and I. Gkigkitzis : "Horava-Lifshitz gravity: calculation of radar signal delay contribution in the vicinity of the Sun in the Kehagias-Sfetsos solution",
    2011, Astrophysics and Space Science, 335(5), pp.539-543.

27. I. Haranas, O. Ragos and I. Gkigkitzis : "Radar signal delay in the Dvali-Gabadadze-Porrati gravity in the vicinity of the Sun",
    2012, Astrophysics and Space Science, 342(1), pp.281-285.

28. I. Haranas, O. Ragos and I. Gkigkitzis : "Effects in the anomalistic period of celestial bodies due to a logarithmic correction to the Newtonian gravitational potential",
    2013, Astrophysics and Space Science, 345(1), pp.67-72.

Publications in conference proceedings :

1. O. Ragos, M.N. Vrahatis and F.A. Zafiropoulos : "The topological degree for the computation of the total number of equilibrium points inODEs",
   1995, 3rd International Colloquium on Numerical Analysis : Invited Lectures and Short Communications (1994, Plovdiv, Bulgaria),
   edited by D. Bainov and A. Dishliev, Sc. Cult. Techn. Publ., Singapore,pp.147-156.

2. O. Ragos and C.G. Zagouras : "A numerical algorithm for the determination of regions of quasi-periodic motion in two-dimensional Hamiltonian systems",
   1995, 3rd International Colloquium on Numerical Analysis : Invited Lectures and Short Communications (1994, Plovdiv, Bulgaria),
   edited by D. Bainov and A. Dishliev, Sc. Cult. Techn. Publ., Singapore,pp.157-164.

3. O. Ragos, M.N. Vrahatis and F.A. Zafiropoulos : "The topological degree for the computation of the exact number of equilibrium points ofdynamical systems", 1994, Proceedings of the 2nd Hellenic-European Conference on Mathematics and Informatics HERMIS 94,
   Athens, Greece, Vol.2, pp.533-542.

4. O. Ragos, M.N. Vrahatis and G.S. Androulakis : "Methods for thecomputation of periodic solutions of dynamical systems",
   1996, Proceedings of the Sixth International Colloquium on Differential Equations (1995, Plovdiv, Bulgaria),
   edited by D. Bainov, VSP, Netherlands, pp.213-220.

5. O. Ragos, M.N. Vrahatis and F.A. Zafiropoulos : "The computation of equilibrium points of up-to-three dimensional dynamical systems using thetopological degree theory",
   1996, Proceedings of the Sixth International Colloquium on Differential Equations (1995, Plovdiv, Bulgaria),
   edited by D. Bainov, VSP, Netherlands, pp.221-228.

6. F.A. Zafiropoulos, T.N. Grapsa, O. Ragos and M.N. Vrahatis : "Onthe computation of zeros of Bessel and Bessel-related functions",
   1996, Proceedings of the Sixth International Colloquium on Differential Equations (1995, Plovdiv, Bulgaria),
   edited by D. Bainov, VSP, Netherlands, pp.409-417.

7. F.A. Zafiropoulos, O. Ragos and M.N. Vrahatis : "Linear viscoelastic wave propagation",
   1996, Proceedings of the Sixth International Colloquium on Differential Equations (1995, Plovdiv, Bulgaria),
   edited by D. Bainov, VSP, Netherlands, pp.417-423.

8. M.N. Vrahatis, O. Ragos, F.A. Zafiropoulos and E.C. Triantafylou :"On the computation of all the equilibrium points in Hamiltonian systems with three degrees of freedom",
   1999, Proceedings of the NATO Advanced Study Institute on Hamiltonian Systems with Three or More Degrees of Freedom (1995, S'Agaro, Spain),
   edited by C. Simo, NATO ASI Series, Series C, Vol.533, Kluwer Academic Publishers, Netherlands, pp.638-641.

9. M.N. Vrahatis, O. Ragos and G.S. Androulakis : "A method for computing families of periodic orbits based on unconstrained oprimization",
   1999, Proceedings of the NATO Advanced Study Institute on Hamiltonian Systems with Three or More Degrees of Freedom (1995, S'Agaro, Spain),
   edited by C. Simo, NATO ASI Series, Series C, Vol.533, Kluwer Academic Publishers, Netherlands, pp.642-645.

10. O. Ragos, E.A. Perdios, V.S. Kalantonis and M.N. Vrahatis : "On the equilibrium points of the relativistic restricted three-body problem",
    Proceedings of the Third World Congress of Nonlinear Analysis (2000, Sicily, Italy), edited by V. Lakshmikantham,
    2001, Nonlinear Analysis, 47(5), pp.3413-3418.

11. E.A. Perdios, O. Ragos, A.E. Perdiou and M.N. Vrahatis : "Symmetric doubly asymptotic orbits in the photogravitational restricted three-body problem",
    Proceedings of the Third World Congress of Nonlinear Analysis (2000, Sicily, Italy), edited by V. Lakshmikantham,
    2001, Nonlinear Analysis, 47(5), pp.3443-3448.

12. M.N. Vrahatis, O. Ragos and G.S. Androulakis : "Computing families of periodic orbits through optimization methods",
    Proceedings of the Third World Congress of Nonlinear Analysis (2000, Sicily, Italy), edited by V. Lakshmikantham,
    2001, Nonlinear Analysis, 47(5), pp.3449-3454.