@article{MZM_1997_61_5_a2,
     author = {I. V. Zefirov},
     title = {Commuting algebraic correspondences and groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {662--670},
     publisher = {mathdoc},
     volume = {61},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_5_a2/}
}