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Sidel'nikova, N.A. Deficiency Indices of the Singular Differential Operator Generated by the Expression y IV - 2a(x α y 1)1 + bx β y . Mathematical Notes 73, 148–151 (2003). https://doi.org/10.1023/A:1022194622190
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DOI: https://doi.org/10.1023/A:1022194622190