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@article{MZM_1992_51_5_a1, author = {V. F. Babenko}, title = {The best $L_1$-approximations by splines in the presence of restrictions on their derivatives}, journal = {Matemati\v{c}eskie zametki}, pages = {12--19}, publisher = {mathdoc}, volume = {51}, number = {5}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_5_a1/} }
V. F. Babenko. The best $L_1$-approximations by splines in the presence of restrictions on their derivatives. Matematičeskie zametki, Tome 51 (1992) no. 5, pp. 12-19. http://geodesic.mathdoc.fr/item/MZM_1992_51_5_a1/