A proof and extension of Dehn's lemma
Matematika, Tome 4 (1960) no. 1, pp. 9-14.

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     author = {A. Shapiro and J. H. Whitehead},
     title = {A proof and extension of {Dehn's} lemma},
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A. Shapiro; J. H. Whitehead. A proof and extension of Dehn's lemma. Matematika, Tome 4 (1960) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a1/