Пример ссылки в Bulletin of the American Mathematical Society:
A.M. Shelekhov, Classification of multidimensional three-webs according to closure conditions (Russian), Probl. Geom. 21, 109–154, Itogi Nauki i Tekhniki, Akad. Nauk SSSR Vsesoyuz. Inst. Nauchn. i Tekhn. Inform., Moscow, 1989. English translation: Soviet Math. 55 (1991), no. 6, 2140–2168.
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