Geodesic
An Improved Wintner Oscillation Criterion for Second Order Linear Differential Equations
Canadian mathematical bulletin, Tome 27 (1984) no. 1, pp. 117-121

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An iterative technique is used to establish an oscillation theorem for the equation x′′+ a(t)x=0 which relaxes the condition that a(t) satisfy without the restriction that
DOI : 10.4153/CMB-1984-017-5
Mots-clés : 34C10, Oscillatory solution, non-oscillatory solution, Riccati equation, principal solution, non-principal solution 
Johnson, George W.; Yan, Jurang. An Improved Wintner Oscillation Criterion for Second Order Linear Differential Equations. Canadian mathematical bulletin, Tome 27 (1984) no. 1, pp. 117-121. doi: 10.4153/CMB-1984-017-5
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     author = {Johnson, George W. and Yan, Jurang},
     title = {An {Improved} {Wintner} {Oscillation} {Criterion} for {Second} {Order} {Linear} {Differential} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {117--121},
     year = {1984},
     volume = {27},
     number = {1},
     doi = {10.4153/CMB-1984-017-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1984-017-5/}
}
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