1. Banachiewicz, Th.: 1938, Bull. Acad. Polonaise (Krakó), A. pp. 134–135 and 393–404.
2. Banachiewicz, Th.: 1942, Astron. J. 50, pp. 38–41.
3. Benoit, Commandant: 1924, Bullentin Géodésique (Toulouse) No. 2, pp. 67–77.
4. Bryson, A.R. Jr. and Ho, Y.C.: 1969, Applied Optimal Control, Blaisdell Publishing Co., Waltham, Mass.
5. Bucy, R.S. and Joseph, P.D.: 1968, Filtering for Stochastic Processes with Applications in Guidance, Interscience Publishers, New York.