@article{DE_2004_40_5_a13,
     author = {V. P. Maslov and A. I. Shafarevich},
     title = {On {Asymptotic} {Solutions} of {Nonlinear} {Equations} in the {Presence} of {Turning} {Points}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {686--691},
     publisher = {mathdoc},
     volume = {40},
     number = {5},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_5_a13/}
}