@article{MZM_1976_19_3_a1,
     author = {V. F. Babenko and A. A. Ligun},
     title = {The order of the best one-sided approximation by polynomials and splines in the $L_p$-metric},
     journal = {Matemati\v{c}eskie zametki},
     pages = {323--329},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_3_a1/}
}