@ARTICLE{Chigansky06a,
author = "Chigansky, Pavel and van Handel, Ramon",
title = "Model robustness of finite state nonlinear filtering over the infinite time horizon",
journal = "Ann. Appl. Probab.",
volume = "17",
pages = "688-715",
year = "2007",
doi = "10.1214/105051606000000871"
}