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@article{TRSPY_1965_76_a2, author = {Yu. F. Borisov}, title = {A~half-neighborhood and the variation of length of a~curve on a~surface}, journal = {Informatics and Automation}, pages = {26--48}, publisher = {mathdoc}, volume = {76}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1965_76_a2/} }
Yu. F. Borisov. A~half-neighborhood and the variation of length of a~curve on a~surface. Informatics and Automation, Two-dimensional manifolds of bounded curvature. Part II. Collection of articles on the intrinsic geometry of surfaces, Tome 76 (1965), pp. 26-48. http://geodesic.mathdoc.fr/item/TRSPY_1965_76_a2/