@article{DAN_1960_130_1_a2,
     author = {E. P. Dolzhenko},
     title = {Differentiation of complex functions},
     journal = {Doklady Akademii Nauk},
     pages = {17--20},
     publisher = {mathdoc},
     volume = {130},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_1_a2/}
}