@article{MAT_1958_2_4_a1,
     author = {C. D. Papakyriakopoulos},
     title = {On {Dehn's} lemma and the asphericity of knots},
     journal = {Matematika},
     pages = {23--47},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1958_2_4_a1/}
}