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Kauffman, R.M. (1976). On the limit-n classification of ordinary differential operators with positive coefficients. In: Everitt, W.N., Sleeman, B.D. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 564. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0087342
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DOI: https://doi.org/10.1007/BFb0087342
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