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@article{TM_1965_76_a11, author = {A. L. Verner}, title = {A~semi-geodesic coordinate net on tubes of non-positive curvature}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {130--140}, publisher = {mathdoc}, volume = {76}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1965_76_a11/} }
A. L. Verner. A~semi-geodesic coordinate net on tubes of non-positive curvature. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Two-dimensional manifolds of bounded curvature. Part II. Collection of articles on the intrinsic geometry of surfaces, Tome 76 (1965), pp. 130-140. http://geodesic.mathdoc.fr/item/TM_1965_76_a11/