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References
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Ahlbrandt, C.D., Hinton, D.B., Lewis, R.T. (1981). Some unitarily equivalent differential operators with finite and infinite singularities. In: Everitt, W.N., Sleeman, B.D. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 846. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0089821
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DOI: https://doi.org/10.1007/BFb0089821
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