@article{MZM_1999_65_4_a6,
     author = {V. V. Kurta},
     title = {On the absence of positive solutions of elliptic equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {552--561},
     year = {1999},
     volume = {65},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_4_a6/}
}