@article{KYB_1972_8_5_a4,
     author = {Soukup, V\'aclav},
     title = {On formulation of state equations for linear nonstationary discrete-time system},
     journal = {Kybernetika},
     pages = {419--429},
     year = {1972},
     volume = {8},
     number = {5},
     mrnumber = {0332256},
     zbl = {0251.93017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1972_8_5_a4/}
}