A type of second order linear ordinary differential equations with periodic coefficients for which the characteristic exponents have exact expressions
2007 ◽
Vol 38
(2)
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pp. 189-211
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1987 ◽
Vol 63
(4)
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pp. 98-101
1958 ◽
Vol 34
(5)
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pp. 229-234
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1984 ◽
Vol 101
(2)
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pp. 325-347
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1977 ◽
Vol 29
(1-2)
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pp. 88-102
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