Nonoscillatory solutions of forced second-order linear equations
1976 ◽
Vol 56
(2)
◽
pp. 452-459
◽
1980 ◽
Vol 126
(1)
◽
pp. 299-317
◽
1974 ◽
Vol 15
(12)
◽
pp. 2063-2066
◽
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