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3. Magnus, W., Infinite Determinants in the Theory of Mathieu's and Hill's Equations. New York University, Institute of Mathematical Sciences, Research Report BR-1 (1953).
4. Magnus, W., Infinite determinants associated with Hill's equation. Pacific Journal of Math. 5, Suppl. 2, 941?951 (1955).
5. Magnus, W., & A. Shenitzer, Hill's Equation. Part I: General Theory. New York University, Institute of Mathematical Sciences, Research Report BR-22 (1957).