Geodesic
Some Comparison Theorems for Conjugate And σ-Points
Canadian journal of mathematics, Tome 28 (1976) no. 6, pp. 1172-1179

Voir la notice de l'article provenant de la source Cambridge University Press

Section 1 of this paper is concerned with the effect on conjugate and σ-points of various perturbations of q(x) for differential equations of the form 
Leighton, Walter. Some Comparison Theorems for Conjugate And σ-Points. Canadian journal of mathematics, Tome 28 (1976) no. 6, pp. 1172-1179. doi: 10.4153/CJM-1976-116-5
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