@article{DAN_1990_310_4_a4,
     author = {P. M. Makienko},
     title = {Modular groups of certain rational functions},
     journal = {Doklady Akademii Nauk},
     pages = {793--794},
     publisher = {mathdoc},
     volume = {310},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_4_a4/}
}