The normal Euler numbers of the projective plane and Klein bottle in four-dimensional Euclidean space
Doklady Akademii Nauk, Tome 191 (1970) no. 1, pp. 27-29
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@article{DAN_1970_191_1_a6,
author = {V. A. Rokhlin},
title = {The normal {Euler} numbers of the projective plane and {Klein} bottle in four-dimensional {Euclidean} space},
journal = {Doklady Akademii Nauk},
pages = {27--29},
year = {1970},
volume = {191},
number = {1},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a6/}
}
V. A. Rokhlin. The normal Euler numbers of the projective plane and Klein bottle in four-dimensional Euclidean space. Doklady Akademii Nauk, Tome 191 (1970) no. 1, pp. 27-29. http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a6/