Geodesic
On Dehn's lemma and the asphericity of knots
Matematika, Tome 2 (1958) no. 4, pp. 23-47.

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     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/}
}
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C. D. Papakyriakopoulos. On Dehn's lemma and the asphericity of knots. Matematika, Tome 2 (1958) no. 4, pp. 23-47. http://geodesic.mathdoc.fr/item/MAT_1958_2_4_a1/