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@article{MZM_1979_25_4_a9, author = {M. Otelbaev}, title = {A criterion for the resolvent of a {Sturm--Liouville} operator to be kernel}, journal = {Matemati\v{c}eskie zametki}, pages = {569--572}, publisher = {mathdoc}, volume = {25}, number = {4}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_4_a9/} }
M. Otelbaev. A criterion for the resolvent of a Sturm--Liouville operator to be kernel. Matematičeskie zametki, Tome 25 (1979) no. 4, pp. 569-572. http://geodesic.mathdoc.fr/item/MZM_1979_25_4_a9/