%0 Journal Article
%A C. D. Papakyriakopoulos
%T Some problems on $3$-dimensional manifolds
%J Matematika
%D 1960
%P 15-30
%V 4
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a2/
%G ru
%F MAT_1960_4_1_a2