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@article{TRSPY_1949_30_a0, author = {N. V. Efimov}, title = {Qualitative problems of the theory of deformations of surfaces in the small}, journal = {Informatics and Automation}, pages = {3--128}, publisher = {mathdoc}, volume = {30}, year = {1949}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1949_30_a0/} }
N. V. Efimov. Qualitative problems of the theory of deformations of surfaces in the small. Informatics and Automation, Qualitative problems of the theory of deformations of surfaces in the small, Tome 30 (1949), pp. 3-128. http://geodesic.mathdoc.fr/item/TRSPY_1949_30_a0/