@article{AL_2011_50_5_a4,
     author = {A. N. Khisamiev},
     title = {$\Sigma$-uniform structures and $\Sigma${-functions.~I}},
     journal = {Algebra i logika},
     pages = {659--684},
     publisher = {mathdoc},
     volume = {50},
     number = {5},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2011_50_5_a4/}
}