[1] B. v. Sz.-Nagy:
Spektraldarstellung linearer Transformationen des Hilbertschen Raumes. 1942.
Zbl 0146.12602
[2] N. Dunford J. T. Schwartz: Linear operators, I, II, III. 1958, 1963, 1971.
[3] B. Fuglede:
A commutativity theorem for normal operators. Proc. N.A.S., 36 (1950), 35-40.
MR 0032944 |
Zbl 0035.35804
[4] I. E. Segal R. A. Kunze:
Integrals and operators. 1978.
MR 0486380