@article{IVM_2020_8_a1,
     author = {A. B. Zaitsev},
     title = {On the maximum principle for solutions of second order elliptic equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--17},
     year = {2020},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_8_a1/}
}