Voina, O.A. and Sidorov, M.V. (1994) “Equations of optimal nonlinear filtration and interpolation for partially observed Markov processes”, Ukrains’kyi Matematychnyi Zhurnal, 46(8), pp. 971–976. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5649 (Accessed: 10 April 2025).