1989
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. Lyapunov spectrum of ergodic stationary systems perturbed by white noise. Stochastics Stochastics Rep. 1989;27:23–31.
1988
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. Existence of an optimal {M}arkovian filter for the control under partial observations. SIAM J. Control Optim. 1988;26:1025–1061. doi:10.1137/0326057.
1987
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. Compactification methods in the control of degenerate diffusions: existence of an optimal control. Stochastics. 1987;20:169–219. doi:10.1080/17442508708833443.
1986
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. Existence d'un filtre markovien optimal en contrôle partiellement observable. C. R. Acad. Sci. Paris Sér. I Math. 1986;303:31–34.