@article{IVM_1999_9_a4,
     author = {A. K. Rybnikov},
     title = {Special connections that determine the zero curvature representation for second-order evolution equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {32--41},
     publisher = {mathdoc},
     number = {9},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_9_a4/}
}