@article{TM_1987_180_a36,
     author = {A. V. Bushanskii},
     title = {Best approximation in the mean of multiply monotone functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {74--75},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a36/}
}