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PHYSICS
On the classification of the curvature tensor by means of principal congruences
R. F. Polishchuk
Citation:
R. F. Polishchuk, “On the classification of the curvature tensor by means of principal congruences”, Dokl. Akad. Nauk SSSR, 194:1 (1970), 62–65
Linking options:
https://www.mathnet.ru/eng/dan35648 https://www.mathnet.ru/eng/dan/v194/i1/p62
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