Geodesic
Transonic cascade flows as a weak solution of boundary value problem (Small disturbance theory)
Theoretical and applied mechanics, Tome 2 (1976) no. 1, p. 49 
Karel Kozel; Jan Polášek. Transonic cascade flows as a weak solution of boundary value problem (Small disturbance theory). Theoretical and applied mechanics, Tome 2 (1976) no. 1, p. 49 . http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a7/
@article{TAM_1976_2_1_a7,
     author = {Karel Kozel and Jan Pol\'a\v{s}ek},
     title = {Transonic cascade flows as a weak solution of boundary value problem {(Small} disturbance theory)},
     journal = {Theoretical and applied mechanics},
     pages = {49 },
     year = {1976},
     volume = {2},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a7/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The paper deals with the formulation of the problem of two-dimensional transonic flow around a lattice of thin airfoils as a boundary value problem for an equation of mixed elliptic-hyperbolic type. The problem is uniquely solvable and the solution continuously depends on the shape of the streamlined profiles in the lattice and on the input Mach number $M_11$.