Indirect evidence for short period magnetic cycles in W UMa stars - Period analysis of five overcontact systemsT. Borkovits, M. M. Elkhateeb, Sz. Csizmadia, J. Nuspl, I. B. Bíró, T. Hegedüs and R. CsorvásiA&A, 441 3 (2005) 1087-1097DOI: https://doi.org/10.1051/0004-6361:20052805
