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Zur Theorie der Differentialpolynome. I: Differentialpolynome in einer Unbestimmten. - II. Differentialpolynome in mehreren Unbestimmten. (On the theory of differential polynomials. I: Differential polynomials in one variable. II: Differential polynomials in several variables). (German) Zbl 0221.12055
Ann. Univ. Saraviensis 6, 311-323; 324-336 (1957).
13N10 Commutative rings of differential operators and their modules
12H05 Differential algebra