Style de citation APA (7e éd.)
Ettl, A. (1977). The Deficiency Index Problem for powers of ordinary differential expressions.
Style de citation Chicago (17e éd.)
Ettl, Anton. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. 1977.
Style de citation MLA (9e éd.)
Ettl, Anton. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. 1977.
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