Geodesic
An expression for the trace of the difference between two singular differential operators of the Sturm–Liouvilie type
Doklady Akademii Nauk, Tome 115 (1957) no. 5, pp. 878-881 
L. D. Faddeev. An expression for the trace of the difference between two singular differential operators of the Sturm–Liouvilie type. Doklady Akademii Nauk, Tome 115 (1957) no. 5, pp. 878-881. http://geodesic.mathdoc.fr/item/DAN_1957_115_5_a7/
@article{DAN_1957_115_5_a7,
     author = {L. D. Faddeev},
     title = {An expression for the trace of the difference between two singular differential operators of the {Sturm{\textendash}Liouvilie} type},
     journal = {Doklady Akademii Nauk},
     pages = {878--881},
     year = {1957},
     volume = {115},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_5_a7/}
}
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