Jivkov, Vesselin, and Xiao Rong LI. "On the Generalized Input Estimation." Information & Security: An International Journal 9 (2002): 107-113.

LI, Xiao Rong, and Vesselin Jilkov. A Survey of Maneuvering Target Tracking?Part IV: Decision-Based Methods In SPIE Conf. Signal and Data Processing of Small Targets, Orlando, Florida., 2002.

Bar-Shalom, Yaakov, T. Kirubarajan, and Xiao Rong LI. Estimation with Applications to Tracking and Navigation: Theory, Algorithms, and Software. New York: Wiley, 2001.