@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/}
}