Geodesic
On the linear differential equations whose solutions are the products of solutions of two given linear differential equations.
Bollettino della Unione matematica italiana, Série 3, Tome 12 (1957) no. 1, pp. 12-15.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

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Bellman, Richard. On the linear differential equations whose solutions are the products  of solutions of two given linear differential equations.. Bollettino della Unione matematica italiana, Série 3, Tome 12 (1957) no. 1, pp. 12-15. http://geodesic.mathdoc.fr/item/BUMI_1957_3_12_1_a2/

[1] C. Appell Comptes Rendus, XCI (1880). pp. 211-214.

[2] E. T. Whittaker and G. N. Watson , Modern Analysis, Cambridge, 1935, p. 418.