@article{VMUMM_1993_6_a5,
     author = {P. V. Al'brecht},
     title = {On operators of almost best approximations on the classes $W^rH_\omega$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {22--29},
     publisher = {mathdoc},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_6_a5/}
}