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@article{MZM_1970_8_2_a13, author = {Yu. A. Volkov and V. I. Oliker}, title = {Uniqueness of the solution of {Christoffel's} problem for nonclosed surfaces}, journal = {Matemati\v{c}eskie zametki}, pages = {251--257}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a13/} }
Yu. A. Volkov; V. I. Oliker. Uniqueness of the solution of Christoffel's problem for nonclosed surfaces. Matematičeskie zametki, Tome 8 (1970) no. 2, pp. 251-257. http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a13/