@article{DAN_1973_213_6_a0,
     author = {F. D. Gakhov and E. I. Zverovich and S. G. Samko},
     title = {Increment of the argument, logarithmic residue, and the generalized argument principle},
     journal = {Doklady Akademii Nauk},
     pages = {1233--1236},
     publisher = {mathdoc},
     volume = {213},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a0/}
}