@article{VUU_2006_1_a2,
     author = {A. F. Gabdrahimov and V. A. Zaitsev},
     title = {Lyapunov reducibility for four-dimensional linear stationary control systems in the class of the piecewise-constant control functions},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {25--40},
     publisher = {mathdoc},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2006_1_a2/}
}