[1] Z. ALTSHULER P. G. CASAZZA, BOR-LUH LIN: On symmetric basic sequences in Lorentz sequence spaces. Israel J. of Math. 15 (1973), 140-155. MR 0328553

[2] A. M. DAVIE: The approximation problem for Banach spaces. Bull. London Math. Soc. 5 (1973), 261-266. MR 0338735 | Zbl 0267.46013

[3] P. ENFLO: A counterexample to the approximation problem. Acta Math. 130 (1973), 309-317. MR 0402468 | Zbl 0267.46012

[4] A. GROTHENDIECK: Produits tensorieles topologiques et espaces nucléaires. Memoirs Amer. Math. Soc, No. 16, 1955. MR 0075539

[5] J. LINDENSTRAUSS L. TZAFRIRI: Classical Banach spaces. Lect. Notes in Math., vol. 338, Springer-Verlag, New York, 1973. MR 0415253

[6] H. G. TUCKER: A Graduate Course in Probability. Academic Press, New York, 1967. MR 0221541

[7] A. C. ZAANEN: Integration. Second edition, North-Holland, Amsterdam, 1967. MR 0222234 | Zbl 0175.05002