@article{VUU_2010_3_a2,
     author = {I. S. Zagrebina},
     title = {Upper-bound estimate for {Lyapunov} exponents of perturbed abstract linear system},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {18--24},
     publisher = {mathdoc},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2010_3_a2/}
}