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Generalized de la Vallée Poussin Disconjugacy Tests for Linear Differential Equations(1)
Canadian mathematical bulletin, Tome 14 (1971) no. 3, pp. 419-428

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In this paper, we study the oscillatory behavior of the solutions of the linear differential equation (1.1) where (1.2) and all functions are assumed to be continuous on a bounded interval [a, b). An «th-order linear equation is said to be disconjugate on an interval I provided it has no nontrivial solution with more than n — 1 zeros, counting multiplicities, in I. 
Willett, D. Generalized de la Vallée Poussin Disconjugacy Tests for Linear Differential Equations(1). Canadian mathematical bulletin, Tome 14 (1971) no. 3, pp. 419-428. doi: 10.4153/CMB-1971-073-3
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     author = {Willett, D.},
     title = {Generalized de la {Vall\'ee} {Poussin} {Disconjugacy} {Tests} for {Linear} {Differential} {Equations(1)}},
     journal = {Canadian mathematical bulletin},
     pages = {419--428},
     year = {1971},
     volume = {14},
     number = {3},
     doi = {10.4153/CMB-1971-073-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-073-3/}
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