@article{DAN_1968_179_5_a11,
     author = {Yu. I. Lyubich},
     title = {The convergence of the process of steepest descent},
     journal = {Doklady Akademii Nauk},
     pages = {1054--1056},
     publisher = {mathdoc},
     volume = {179},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_5_a11/}
}