Geodesic
The maximum principle for systems of second-order equations of
Doklady Akademii Nauk, Tome 305 (1989) no. 4, pp. 783-786 
K. B. Sabitov. The maximum principle for systems of second-order equations of. Doklady Akademii Nauk, Tome 305 (1989) no. 4, pp. 783-786. http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/
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     author = {K. B. Sabitov},
     title = {The maximum principle for systems of second-order equations of},
     journal = {Doklady Akademii Nauk},
     pages = {783--786},
     year = {1989},
     volume = {305},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/}
}
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