%0 Journal Article %A Ewa Kozłowska-Walania %T On commutativity and ovals for a pair of symmetries of a Riemann surface %J Colloquium Mathematicum %D 2007 %P 61-69 %V 109 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm109-1-5/ %R 10.4064/cm109-1-5 %G en %F 10_4064_cm109_1_5