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@article{DE_1985_21_4_a10, author = {A. A. Stakun}, title = {Trace formulas for a singular differential operator with a turning point}, journal = {Differencialʹnye uravneni\^a}, pages = {636--646}, publisher = {mathdoc}, volume = {21}, number = {4}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_4_a10/} }
A. A. Stakun. Trace formulas for a singular differential operator with a turning point. Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 636-646. http://geodesic.mathdoc.fr/item/DE_1985_21_4_a10/