@article {MR1681538,
	title = {On the one point {L}yapunov spectrum of ergodic stationary difference systems perturbed by random noise},
	journal = {Vietnam J. Math.},
	volume = {25},
	number = {2},
	year = {1997},
	pages = {141{\textendash}150},
	issn = {0866-7179},
	author = {Nguyen Huu Du and Tran Van Nhung}
}
