Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1973__9_1_a2, author = {Soukup, V\'aclav}, title = {Linear nonstationary system with discrete-time input}, journal = {Kybernetika}, pages = {--41}, publisher = {mathdoc}, volume = {09}, number = {1}, year = {1973}, mrnumber = {0332257}, zbl = {0253.93019}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1973__9_1_a2/} }
Soukup, Václav. Linear nonstationary system with discrete-time input. Kybernetika, Tome 09 (1973) no. 1, p. 41. http://geodesic.mathdoc.fr/item/KYB_1973__9_1_a2/