@article{IVM_2015_8_a2,
     author = {I. S. Kalinina and S. S. Marchenkov},
     title = {On complexity of problem of satisfiability for systems of countable-valued functional equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {25--32},
     publisher = {mathdoc},
     number = {8},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2015_8_a2/}
}