1. K. Maurin, ?Eine Bemerkung zur allgemeinen Eigenfunktionsentwicklungen für vertauschbare Operatorensysteme beliebiger Mächtigkeit,? Bull. Acad. Polon. Sci., Ser. Math. Astron. et Phys.,8, No. 6, 381?384 (1960).
2. Yu.M. Berezanskii Eigenfunction Expansions for Selfadjoint Operators [in Russian], Naukova Dumka, Kiev (1955).
3. Yu.M. Berezanskii, ?Integral representation of Wightman type positive definite functionals,? Ukrainsk. Matem. Zh.,19, No. 1, 89?95 (1967).
4. Yu.M. Berezanskii, ?The problem of moments and representations of Wightman type functionals by 1968, Wroclaw (1968).
5. A.N. Kolmogorov, Foundations of the Theory of Probability [in Russian], Moscow-Leningrad (1936).