Recurrence of Order in Chaos. - Georgios Contopoulos; M. Harsoula; Rudolf Dvorak; Florian Freistetter (Int. J. Bifurc. Chaos, 2005)

Stickiness in Chaos. - Georgios Contopoulos; M. Harsoula (Int. J. Bifurc. Chaos, 2008)

Stickiness Effects in Conservative Systems. - Georgios Contopoulos; M. Harsoula (Int. J. Bifurc. Chaos, 2010)

Diffusion of Chaotic orbits in barred Spiral Galaxies. - M. Harsoula; C. Kalapotharakos; Georgios Contopoulos (Int. J. Bifurc. Chaos, 2011)