@article{IVM_1971_12_a8,
     author = {A. I. Koshelev},
     title = {A~certain inequality for second order elliptic operators with bounded coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {75--80},
     publisher = {mathdoc},
     number = {12},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_12_a8/}
}