TY  - JOUR
AU  - C. D. Papakyriakopoulos
TI  - Some problems on $3$-dimensional manifolds
JO  - Matematika
PY  - 1960
SP  - 15
EP  - 30
VL  - 4
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a2/
LA  - ru
ID  - MAT_1960_4_1_a2
ER  -