Geodesic
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},
     publisher = {mathdoc},
     volume = {191},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a6/}
}
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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/