@article{DAN_1960_130_5_a4,
     author = {I. V. Ostrovskii},
     title = {Location of the zeros of the derivative of an entire function whose zeros lie close to the real axis},
     journal = {Doklady Akademii Nauk},
     pages = {973--976},
     year = {1960},
     volume = {130},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_5_a4/}
}