Geodesic
Conditions for the negativity of the Green's function of a Sturm–Liouville problem for a second order linear ordinary differential equation
Differencialʹnye uravneniâ, Tome 5 (1969) no. 6, pp. 1114-1119 
G. N. Zhevlakov; S. A. Pak. Conditions for the negativity of the Green's function of a Sturm–Liouville problem for a second order linear ordinary differential equation. Differencialʹnye uravneniâ, Tome 5 (1969) no. 6, pp. 1114-1119. http://geodesic.mathdoc.fr/item/DE_1969_5_6_a14/
@article{DE_1969_5_6_a14,
     author = {G. N. Zhevlakov and S. A. Pak},
     title = {Conditions for the negativity of the {Green's} function of a {Sturm{\textendash}Liouville} problem for a second order linear ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1114--1119},
     year = {1969},
     volume = {5},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_6_a14/}
}
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