1. Operators induced in function classes;Arens;Monatsh. Math.,1951
2. The adjoint of a bilinear operation;Arens;Proc. Amer. Math. Soc.,1951
3. Amenable unitary representations of locally compact groups;Bekka;Invent. Math.,1990
4. A Course in Functional Analysis;Conway,1990
5. Linear Operators, Part 1;Dunford,1964