@article{MZM_1978_23_6_a15,
     author = {I. I. Ibragimov and F. G. Nasibov},
     title = {Letter to the editors},
     journal = {Matemati\v{c}eskie zametki},
     pages = {915--919},
     publisher = {mathdoc},
     volume = {23},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_6_a15/}
}