@article{DE_1986_22_5_a14,
     author = {M. E. Lerner},
     title = {Maximum modulus principles for hyperbolic equations and systems of equations in nonclassical domains},
     journal = {Differencialʹnye uravneni\^a},
     pages = {848--858},
     publisher = {mathdoc},
     volume = {22},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_5_a14/}
}