@article{KYB_1971_7_1_a4,
     author = {H\'ajek, Miloslav},
     title = {The characteristic polynomial of the feedback connection of dynamical systems},
     journal = {Kybernetika},
     pages = {48--57},
     year = {1971},
     volume = {7},
     number = {1},
     mrnumber = {0284230},
     zbl = {0215.30103},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1971_7_1_a4/}
}