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@article{MZM_1975_17_5_a8, author = {D. V. Prokhorov}, title = {A~generalization of the {Christoffel--Schwartz} formula}, journal = {Matemati\v{c}eskie zametki}, pages = {749--756}, publisher = {mathdoc}, volume = {17}, number = {5}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_5_a8/} }
D. V. Prokhorov. A~generalization of the Christoffel--Schwartz formula. Matematičeskie zametki, Tome 17 (1975) no. 5, pp. 749-756. http://geodesic.mathdoc.fr/item/MZM_1975_17_5_a8/