00371nam a2200121Ia 4500082002100000100002400021245008700045260003400132300001000166490006300176500000500239700000500244  a519.931bB171.SD  aBalakrishnan, A. V.  aStochastic differential systems; filtering and control a function space approachb  aBerlinbSpringer-Verlagc1973  a252p.  aLecture notes in Economics and Mathematical systemsv , 84  a  a