Institution: | Research Centre of Astronomy, Academy of Athens, Anagnostopoulou 14, GR-10673 Athens, Greece;Division of Applied Analysis, Department of Mathematics and Centre for Research and Application of Nonlinear Systems (CRANS), University of Patras, GR-26500 Patras, Greece;Observatoire de Marseille, 2 Place Le Verrier, F-13248 Marseille Cedex 4, France |