Hopf’s classification theorem in the theory of shapes
Doklady Akademii Nauk, Tome 223 (1975) no. 5, pp. 1056-1059.

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     author = {Yu. T. Lisitsa},
     title = {Hopf{\textquoteright}s classification theorem in the theory of shapes},
     journal = {Doklady Akademii Nauk},
     pages = {1056--1059},
     publisher = {mathdoc},
     volume = {223},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_5_a4/}
}
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Yu. T. Lisitsa. Hopf’s classification theorem in the theory of shapes. Doklady Akademii Nauk, Tome 223 (1975) no. 5, pp. 1056-1059. http://geodesic.mathdoc.fr/item/DAN_1975_223_5_a4/