%0 Journal Article %A Karol Gryszka %T Asymptotic period in dynamical systems in metric spaces %J Colloquium Mathematicum %D 2015 %P 245-257 %V 139 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm139-2-6/ %R 10.4064/cm139-2-6 %G en %F 10_4064_cm139_2_6