Geodesic
Equivalence and invariants of second-order linear partial differential equations in two variables under a~change of variables
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1999), pp. 3-10

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@article{IVM_1999_11_a0,
     author = {U. D. Bekbaev},
     title = {Equivalence and invariants of second-order linear partial differential equations in two variables under a~change of variables},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--10},
     publisher = {mathdoc},
     number = {11},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_11_a0/}
}
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U. D. Bekbaev. Equivalence and invariants of second-order linear partial differential equations in two variables under a~change of variables. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1999), pp. 3-10. http://geodesic.mathdoc.fr/item/IVM_1999_11_a0/