Instabi-ity intervals of Hill’s equation. (English) Zbl 0121.31202

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[1] On the behavior of the solutions of linear periodic differential systems near resonance points, Contributions to the Theory of Nonlinear Oscillations, Vol. 5, 1960, pp. 55–89, Annals of Math. Studies, Princeton Univ. Press, Princeton.
[2] Erdélyi, Ann. Physik 19 pp 585– (1934)
[3] Hochstadt, Comm. Pure Appl. Math. 14 pp 749– (1961)
[4] and , Hill’s equation, I. General theory, New York Univ., Courant Inst. Math. Sci., Div. Electromagnetic Res., Rep. BR-32, 1957.
[5] Special Functions of Mathematical Physics, Holt, Rinehart and Winston, New York, N.Y., 1961. · Zbl 0102.05501
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