@article{VMUMM_2000_3_a1,
     author = {M. K. Potapov and F. M. Berisha},
     title = {On {Jackson's} theorem for the modulus of smoothness determined by a nonsymmetric generalized shift operator},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {7--15},
     publisher = {mathdoc},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2000_3_a1/}
}