Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1971__7_1_a4, author = {H\'ajek, Miloslav}, title = {The characteristic polynomial of the feedback connection of dynamical systems}, journal = {Kybernetika}, pages = {--57}, publisher = {mathdoc}, volume = {07}, number = {1}, year = {1971}, mrnumber = {0284230}, zbl = {0215.30103}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1971__7_1_a4/} }
Hájek, Miloslav. The characteristic polynomial of the feedback connection of dynamical systems. Kybernetika, Tome 07 (1971) no. 1, p. 57. http://geodesic.mathdoc.fr/item/KYB_1971__7_1_a4/