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

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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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     author = {Willett, D.},
     title = {Oscillation on {Finite} or {Infinite} {Intervals} of {Second} {Order} {Linear} {Differential} {Equations(1)}},
     journal = {Canadian mathematical bulletin},
     pages = {539--550},
     year = {1971},
     volume = {14},
     number = {4},
     doi = {10.4153/CMB-1971-096-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-096-8/}
}
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