@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/}
}