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@article{INTG_1969_2_a0, author = {M. A. Akivis}, title = {Three-webs of multidimensional surfaces}, journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara}, pages = {7--31}, publisher = {mathdoc}, volume = {2}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/INTG_1969_2_a0/} }
M. A. Akivis. Three-webs of multidimensional surfaces. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 2 (1969), pp. 7-31. http://geodesic.mathdoc.fr/item/INTG_1969_2_a0/