@article{DE_1972_8_11_a1,
     author = {V. G. Boltyanskii},
     title = {Discrete maximum principle (method of local sections)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1927--1935},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a1/}
}