@article{IVM_2007_9_a2,
     author = {A. K. Rybnikov},
     title = {Theory of connections, {Cole{\textendash}Hopf} transformations and potentials of second-order partial differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--70},
     year = {2007},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2007_9_a2/}
}