@article{IM2_1999_63_3_a5,
     author = {V. P. Motornyi and O. V. Motornaya},
     title = {On the best $L_1$-approximation by algebraic polynomials to truncated powers and to classes of functions with $L_1$-bounded derivative},
     journal = {Izvestiya. Mathematics},
     pages = {561--582},
     year = {1999},
     volume = {63},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_3_a5/}
}