@article{DAN_1990_310_5_a0,
     author = {V. V. Aseev},
     title = {Plane mappings that preserve moduli},
     journal = {Doklady Akademii Nauk},
     pages = {1033--1034},
     year = {1990},
     volume = {310},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_5_a0/}
}