Geodesic
The extremum principle for the generalized Neumann–Tricomi problem
Differencialʹnye uravneniâ, Tome 11 (1975) no. 4, pp. 708-712 
V. P. Egorov. The extremum principle for the generalized Neumann–Tricomi problem. Differencialʹnye uravneniâ, Tome 11 (1975) no. 4, pp. 708-712. http://geodesic.mathdoc.fr/item/DE_1975_11_4_a12/
@article{DE_1975_11_4_a12,
     author = {V. P. Egorov},
     title = {The extremum principle for the generalized {Neumann{\textendash}Tricomi} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {708--712},
     year = {1975},
     volume = {11},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_4_a12/}
}
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