[1] CHATTERJI S. D.: Martingale Convergence and the Randon-Nikodym Theorem in Banach Space. Mathematica Scandinavia, 22, 1968, 21-41. MR 0246341

[2] HANS O., DRIML M.: Conditional Expectation for Generalized Random Variables. In: Transaction of the Second Prague Conference on Information Theory etc., Prague I960.

[3] NEVEU J.: Discrete-parameter martingales. Amsterdam 1975. MR 0402915 | Zbl 0345.60026

[4] TAYLOR A. E.: Introduction to Functional Analysis. New York 1967.