Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TM_1949_30_a0, author = {N. V. Efimov}, title = {Qualitative problems of the theory of deformations of surfaces in the small}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {3--128}, publisher = {mathdoc}, volume = {30}, year = {1949}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1949_30_a0/} }
N. V. Efimov. Qualitative problems of the theory of deformations of surfaces in the small. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Qualitative problems of the theory of deformations of surfaces in the small, Tome 30 (1949), pp. 3-128. http://geodesic.mathdoc.fr/item/TM_1949_30_a0/