2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3468We have carried out a thorough analysis of non-magnetic cataclysmic variables observed with ASCA, and have discovered possible periods in three targets: WW Cet, EI UMa and IX Vel. These may be caused by the rotation of the white dwarf at the centre of the disk, or by the progression of a density wave in the inner accretion disk.2 pages, uses newpasp.sty. To appear in `The Physics of Cataclysmic Variables and Related Objects', ASP Conf. Ser., eds. B.T. Gaensicke, K. Beuermann, K. Reinsch. Original poster available from http://www.star.le.ac.uk/~dbl/publications/Astrophysicstext