@article{IVM_2009_4_a4,
     author = {S. A. Modina},
     title = {Regularization of a~three-element functional equation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--42},
     year = {2009},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2009_4_a4/}
}