1. Hypercomplex systems with continual basis;Berezanskiĭ, Yu. M.;Uspehi Mat. Nauk (N.S.),1957
2. N. Bourbaki, Intégration, Chap. I-V (1952-1956).
3. A note on semi-groups of unbounded self-adjoint operators;Devinatz, A.;Proc. Amer. Math. Soc.,1954
4. On the permutability of normal operators;Devinatz, A.;Ann. of Math. (2),1957
5. Real characters of certain semi-groups with applications;Devinatz, A.;Duke Math. J.,1961