@article{MAT_1960_4_1_a2,
     author = {C. D. Papakyriakopoulos},
     title = {Some problems on $3$-dimensional manifolds},
     journal = {Matematika},
     pages = {15--30},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a2/}
}