@article{TMF_1999_120_2_a4,
     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/}
}