@article{DAN_1985_280_5_a3,
     author = {V. I. Danchenko},
     title = {Estimates of norms and variations of rational constituents of},
     journal = {Doklady Akademii Nauk},
     pages = {1043--1046},
     publisher = {mathdoc},
     volume = {280},
     number = {5},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_280_5_a3/}
}