@article {MR2260777,
	title = {An ergodic theorem for filtering with applications to stability},
	journal = {Systems Control Lett.},
	volume = {55},
	number = {11},
	year = {2006},
	pages = {908{\textendash}917},
	issn = {0167-6911},
	doi = {10.1016/j.sysconle.2006.06.001},
	url = {https://doi.org/10.1016/j.sysconle.2006.06.001},
	author = {Chigansky, Pavel}
}
