@article{IM2_1974_8_5_a2, author = {A. S. Loginov}, title = {Best approximations of continuous functions by piecewise monotone functions}, journal = {Izvestiya. Mathematics }, pages = {991--1008}, publisher = {mathdoc}, volume = {8}, number = {5}, year = {1974}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_5_a2/} }