@article{DAN_1980_250_6_a14,
     author = {V. G. Sheretov},
     title = {Locally extremal quasiconformal mappings},
     journal = {Doklady Akademii Nauk},
     pages = {1338--1340},
     publisher = {mathdoc},
     volume = {250},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_6_a14/}
}