Geodesic
The equivalence of some classes of first-order elliptic and hyperbolic systems and second-order partial differential equations
Differencialʹnye uravneniâ, Tome 23 (1987) no. 9, pp. 1634-1637 
I. E. Pleshchinskaya. The equivalence of some classes of first-order elliptic and hyperbolic systems and second-order partial differential equations. Differencialʹnye uravneniâ, Tome 23 (1987) no. 9, pp. 1634-1637. http://geodesic.mathdoc.fr/item/DE_1987_23_9_a23/
@article{DE_1987_23_9_a23,
     author = {I. E. Pleshchinskaya},
     title = {The equivalence of some classes of first-order elliptic and hyperbolic systems and second-order partial differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1634--1637},
     year = {1987},
     volume = {23},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_9_a23/}
}
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