@article{IVM_2004_5_a7,
     author = {A. K. Rybnikov and K. V. Semenov},
     title = {Ba̋cklund connections and {Ba̋cklund} transformations that correspond to second-order evolution equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {52--68},
     year = {2004},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2004_5_a7/}
}