%0 Journal Article
%A Boyang Ding
%A Changming Ding
%T Prolongational centers and their depths
%J Fundamenta Mathematicae
%D 2016
%P 287-296
%V 234
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm22-10-2015/
%R 10.4064/fm22-10-2015
%G en
%F 10_4064_fm22_10_2015