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References:
[1] M. Švec: Eine Eigenwertaufgabe der Differentialgleichung $y\sp{(4)}+Q(x,\lambda)y=0$ . Чехословацкий математический журнал Т. 6 (81), 1956, 46-71. MR 0080814
[2] R. L. Potter: On self-adjoint differential equation of second order. Pacific J. Math., 3 (1953), 467-491. DOI 10.2140/pjm.1953.3.467 | MR 0056156
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