Similar title to Dempster, M. (1981). The expected value of perfect information in the optimal evolution of stochastic systems. In: Stochastic Differential Systems. Eds. Arato, M., Vermes, D., & Balakrishnan, A.V., pp. 25-40 Berlin/Heidelberg, Germany: Springer. ISBN 978-3-540-38564-6 10.1007/BFb0006404.