Geodesic
Sufficient conditions for non-oscillatory or oscillatory nature of solutions of equation $y''+p(x)y=0$
Doklady Akademii Nauk, Tome 113 (1957) no. 4, pp. 742-745 
V. A. Kondratiev. Sufficient conditions for non-oscillatory or oscillatory nature of solutions of equation $y''+p(x)y=0$. Doklady Akademii Nauk, Tome 113 (1957) no. 4, pp. 742-745. http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a4/
@article{DAN_1957_113_4_a4,
     author = {V. A. Kondratiev},
     title = {Sufficient conditions for non-oscillatory or oscillatory nature of solutions of equation $y''+p(x)y=0$},
     journal = {Doklady Akademii Nauk},
     pages = {742--745},
     year = {1957},
     volume = {113},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a4/}
}
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