Geodesic
Oscillation Theorems for Nonlinear Ordinary Differential Equations of Even Order
Canadian mathematical bulletin, Tome 24 (1981) no. 4, pp. 409-413

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Consider the differential equation 1 where n is even and f(t, y) is subject to the following conditions:(a) f(t, y) is continuous on [0, ∞)× R;(2) (b) f(t, y) is nondecreasing in y for each fixed t∈[0,∞);(c) yf(t, y ) > 0 for y ≠ 0 and t∈[0,∞). 
Kreith, Kurt; Kusano, Takaŝi. Oscillation Theorems for Nonlinear Ordinary Differential Equations of Even Order. Canadian mathematical bulletin, Tome 24 (1981) no. 4, pp. 409-413. doi: 10.4153/CMB-1981-063-1
@article{10_4153_CMB_1981_063_1,
     author = {Kreith, Kurt and Kusano, Taka\^{s}i},
     title = {Oscillation {Theorems} for {Nonlinear} {Ordinary} {Differential} {Equations} of {Even} {Order}},
     journal = {Canadian mathematical bulletin},
     pages = {409--413},
     year = {1981},
     volume = {24},
     number = {4},
     doi = {10.4153/CMB-1981-063-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1981-063-1/}
}
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