Geodesic
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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     author = {R. F. Polishchuk},
     title = {On the classification of the curvature tensor by means of principal congruences},
     journal = {Doklady Akademii Nauk},
     pages = {62--65},
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     volume = {194},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a15/}
}
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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/