@article{IM2_1968_2_5_a2,
     author = {P. M. Tamrazov},
     title = {Extremal conformal mappings and poles of quadratic differentials},
     journal = {Izvestiya. Mathematics },
     pages = {987--996},
     publisher = {mathdoc},
     volume = {2},
     number = {5},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a2/}
}