%0 Journal Article
%A Hanna Patkowska
%T A homotopy extension theorem for fundamental sequences
%J Fundamenta Mathematicae
%D 1969
%P 87-89
%V 64
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-64-1-87-89/
%R 10.4064/fm-64-1-87-89
%G en
%F 10_4064_fm_64_1_87_89