Geodesic
Model problems for two nonlinear equations that type depends on the solution
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 6 (2013) no. 4, pp. 539-547

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Model problems for two nonlinear second-order partial differential equations that type depends on the solution are considered in this article. One of the equations can be called a nonlinear analog of the Lavrent'ev–Bitsadze equation.
Keywords: type of equation, elliptic and hyperbolic equations, Lavrentev–Bitsadze's equation, Tricomi problem. 
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     author = {Isaac I. Vainshtein},
     title = {Model problems for two nonlinear equations that type depends on the solution},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {539--547},
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     number = {4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2013_6_4_a14/}
}
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Isaac I. Vainshtein. Model problems for two nonlinear equations that type depends on the solution. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 6 (2013) no. 4, pp. 539-547. http://geodesic.mathdoc.fr/item/JSFU_2013_6_4_a14/