%0 Journal Article %A Chow, Shui-Nee %A Wang, Duo %T On the monotonicity of the period function of some second order equations %J Časopis pro pěstování matematiky %D 1986 %P 14-25 %V 111 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1986.118260/ %R 10.21136/CPM.1986.118260 %G en %F 10_21136_CPM_1986_118260