1. Abreu J.L. (1970). A note on harmonizable and stationary sequences. Bol. Soc. Mat. Mexicana 15, 48–51.
2. Dubinsky E., Pełczyński A. and Rosenthal H.P. (1972). On Banach spaces X for which Π2(L
∞,X) Studia Math. 44, 617–648.
3. Dunford N. and Schwartz J. (1958). Linear Operators Vol. I, Interscience, N. Y.
4. Mathematical Surveys;J. Diestel,1977
5. Gilbert J.E. and Leih T.J. (1980). Factorization, tensor products, and bilinear forms in Banach space theory, p. 182–305 in Notes in Banach spaces, Ed. Lacey H.E.: Univ. Texas Press, Austin and London.