On the second obstruction to cross-sections
Doklady Akademii Nauk, Tome 130 (1960) no. 4, pp. 723-725.

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     author = {A. M. Vinogradov},
     title = {On the second obstruction to cross-sections},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
     volume = {130},
     number = {4},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/}
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A. M. Vinogradov. On the second obstruction to cross-sections. Doklady Akademii Nauk, Tome 130 (1960) no. 4, pp. 723-725. http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/