On the classification of the curvature tensor by means of principal congruences
Doklady Akademii Nauk, Tome 194 (1970) no. 1, pp. 62-65
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@article{DAN_1970_194_1_a15,
author = {R. F. Polishchuk},
title = {On the classification of the curvature tensor by means of principal congruences},
journal = {Doklady Akademii Nauk},
pages = {62--65},
publisher = {mathdoc},
volume = {194},
number = {1},
year = {1970},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a15/}
}
R. F. Polishchuk. On the classification of the curvature tensor by means of principal congruences. Doklady Akademii Nauk, Tome 194 (1970) no. 1, pp. 62-65. http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a15/