@article{MZM_1992_52_1_a9,
     author = {V. V. Kurta},
     title = {Phragmen--Lindel\"of theorems for second-order semilinear equations with nonnegative characteristic form},
     journal = {Matemati\v{c}eskie zametki},
     pages = {62--67},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_52_1_a9/}
}