1. Semushin, I.V., Using the Active Filtering Principle for Nonstationary Stochastic Processes, in Proc. of III NTK, Novgorod Branch of Ulyanov (Lenin) LETI, Novgorod: LETI Branch, 1968, p. 64.
2. Hampton, R.L.T., On Unknown State-Dependent Noise, Modeling Errors, and Adaptive Filtering, Comput. Elect. Engng., 1975, vol. 2, pp. 195–201.
3. Semoushin, I.V. and Tsyganova, J.V., Auxiliary Performance Functional Approach to Adaptive and Learning Filtering and Control, Conf. Proc. Eur. Control Conf. ECC’99, Karlsruhe, 1999.
4. Semoushin, I.V. and Tsyganova, J.V., Indirect Error Control for Adaptive Filtering, Proc. Third Eur. Conf. Numerical Math. Advanced Appl. ENUMATH’99, Jyvaskyla, July 26–30, 1999, Singapore: World Scientific, 2000, pp. 333–340.
5. Bierman, G.J., Belzer, M.R., Vandercraft, J.S., and Porter, D.W., Maximum Likelihood Estimation Using Square Root Information Filters, IEEE Trans. Automat. Control, 1990, vol. 35, no. 12, pp. 1293–1299.