Stochastic differential systems : filtering and control : proceedings of the IFIP-WG 7/1 working conference, Vilnius, Lithuania, USSR, Aug. 28-Sept. 2, 1978 / edited by B. Grigelionis ; [organized by Institute of Mathematics and Cybernetics of the Lithuanian Academy of Sciences and the Steklov Mathematical Institute of the Academy of Sciences of the USSR] / B.(Bronius) Grigelionis, IFIPWG7.1, LietuvosTSRMokslųakademija.Matematikosirkibernetikosinstitutas, ほか