Geodesic
Laplace invariants of hyperbolic equations linearizable by a differential substitution
Teoretičeskaâ i matematičeskaâ fizika, Tome 120 (1999) no. 2, pp. 237-247

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The boundness of the order of generalized Laplace invariants of a scalar hyperbolic equation is a necessary condition for the existence of a differential substitution transforming solutions of the equation into those of a linear hyperbolic equation. 
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     author = {S. Ya. Startsev},
     title = {Laplace invariants of hyperbolic equations linearizable by a differential substitution},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {237--247},
     publisher = {mathdoc},
     volume = {120},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_120_2_a4/}
}
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S. Ya. Startsev. Laplace invariants of hyperbolic equations linearizable by a differential substitution. Teoretičeskaâ i matematičeskaâ fizika, Tome 120 (1999) no. 2, pp. 237-247. http://geodesic.mathdoc.fr/item/TMF_1999_120_2_a4/