@article{SM_1970_11_4_a0,
     author = {G. N. Blokhina},
     title = {Theorems of {Phragm\'en{\textendash}Lindel\"of} type for linear elliptic equations of second order},
     journal = {Sbornik. Mathematics},
     pages = {467--490},
     year = {1970},
     volume = {11},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_11_4_a0/}
}