Geodesic
Calculation of the regularized trace for the Sturm–Liouville operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 19 (1964) no. 1 
B. M. Levitan. Calculation of the regularized trace for the Sturm–Liouville operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 19 (1964) no. 1. http://geodesic.mathdoc.fr/item/RM_1964_19_1_a8/
@article{RM_1964_19_1_a8,
     author = {B. M. Levitan},
     title = {Calculation of the regularized trace for the {Sturm{\textendash}Liouville} operator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1964},
     volume = {19},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1964_19_1_a8/}
}
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