@article{DAN_1971_199_1_a2,
     author = {A. I. Koshelev},
     title = {An inequality for elliptic operators of second order with restricted coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {17--19},
     publisher = {mathdoc},
     volume = {199},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_199_1_a2/}
}