Geodesic
Oscillation on Finite or Infinite Intervals of Second Order Linear Differential Equations(1)
Canadian mathematical bulletin, Tome 14 (1971) no. 4, pp. 539-550

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

Recently, Ronveaux [11] has shown how to use a combination of a Riccati transformation and a homographie transformation to estimate both from below and above the distance between a zero and the succeeding or preceding extremum (zero of y' ) of solutions of 1.1 In this paper, we show how such transformations can be used to derive an equation from which the distance between successive zeros of a solution y of (1.1) can be estimated directly. 
Willett, D. Oscillation on Finite or Infinite Intervals of Second Order Linear Differential Equations(1). Canadian mathematical bulletin, Tome 14 (1971) no. 4, pp. 539-550. doi: 10.4153/CMB-1971-096-8
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