@article{DE_1999_35_2_a13,
     author = {V. A. Sadovnichy and A. Yu. Popov},
     title = {Estimates for the coefficients of asymptotic series for solutions of the {Sturm--Liouville} equation with an analytic {potential.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {280--284},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_2_a13/}
}