[1] ACHIEZER N. I., GLAZMAN I. M.: Teorija linejnych operatorov v Gilbertovom prostranstve. „Nauka", Moskva 1966.
[2] DAVIES E. B.: 
On the repeated measurements of continuous observables in quantum mechanics. Journ. Func. Anal. 6, 1970, 318-346. 
MR 0368655 
[3] DAVIES E. B., LEWIS J. T.: 
An operational approach to quantum probability. Commun. Math. Phys. 17, 1970, 239-260. 
MR 0263379 | 
Zbl 0194.58304 
[4] DIXMIER J.: 
Les algèbres d'opérateurs dans l'espace hilbertien. Gauthier-Villars, Paris, 1969. 
Zbl 0175.43801 
[5] GUDDER S. P.: 
Spectral methods for a generalized probability theory. Trans. Amer. Math. Soc. 119, 1965, 428-442. 
MR 0183657 | 
Zbl 0161.46105 
[6] GUDDER S. P.: 
Uniqueness and existence properties of bounded observables. Pac. J. Math. 19, 1966, 81-93. 
MR 0201146 | 
Zbl 0149.23603 
[7] GUDDER S. P., MULLIKEN H. C.: 
Measure theoretic convergence of observables and operators. J. Math. Phys. 14, 1973, 234-242. 
MR 0334747 
[9] HELSTROM C. W., LIU J. W. S., GORDON J. P.: 
Quantum-mechanical communication theory. Proc. IEEE 58, 1970, 1578-1598. 
MR 0307790 
[10] HOLEVO A. S.: 
An analog of the theory of statistical decisions in noncommutative probability theory. Trans. Moscow Math. Soc. 26, 1972, 133-149. 
Zbl 0289.62007 
[11] HOLEVO A. S.: 
Statistical decision theory for quantum systems. J. Multiv. Analysis, 4, 1973, 337-349. 
MR 0337245 | 
Zbl 0275.62004 
[12] HOLEVO A. S.: Informacionnyje aspekty quantovovo izmerenija. Pered. Inform. 9, 2, 1973, 31-42.
[15] SHATTEN R.: Norms ideals of copletely continuous operators. Springer, Berlin, 1960.
[16] VARADARAJAN V. S.: 
Probability in physics and a theorem on simultaneous observability. Comm. Pure Appl. Math. 15, 1962, 189-217. 
MR 0163616 | 
Zbl 0109.44705 
[17] VARADARAJAN V. S.: 
Geometry of Quantum Theory, vol. 1. Van Nostrand, Princeton, 1968. 
MR 0471674