Geodesic
Some new cohomological invariants of nonlinear differential equations.~I
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1993), pp. 27-37.

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     author = {I. S. Krasil'shchik},
     title = {Some new cohomological invariants of nonlinear differential {equations.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {27--37},
     publisher = {mathdoc},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1993_1_a4/}
}
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I. S. Krasil'shchik. Some new cohomological invariants of nonlinear differential equations.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1993), pp. 27-37. http://geodesic.mathdoc.fr/item/IVM_1993_1_a4/