MathSciNet bibliographic data MR183940 (32 #1416) 34.20 Chamberlain, Erling William Differential operators approximately of the form \$(1-(1/W(x))\,d/dx)\sp{n}\$$(1-(1/W(x))\,d/dx)\sp{n}$. Proc. Amer. Math. Soc. 16 1965 725–730. Article

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