@article{DAN_1974_218_4_a4,
     author = {R. Rakhmankulov and E. Yakubov},
     title = {On an extremal quasi-conformal mapping of closed {Riemann} surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {761--763},
     publisher = {mathdoc},
     volume = {218},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_4_a4/}
}