Nilpotent ordinary differential operators with polynomial coefficients
2015 ◽
Vol 2016
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pp. 2974-2993
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2003 ◽
Vol 8
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pp. 203-216
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Vol 255
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1999 ◽
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2018 ◽
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pp. 500-503
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1978 ◽
Vol 82
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pp. 117-134
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1982 ◽
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pp. 211-211
2011 ◽
Vol 192
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