1. Schaefer, H.H.: Topological vector spaces. New York: The Macmillan company 1966.
2. Treves, F.: Topological vector spaces. Distributions and kernels. New York-London: Academic Press 1967.
3. Wittstock, G.: Choquetsimplexe und nukleare Räume. Inventiones math.15, 251?258 (1972).
4. Enflo, P.: A counterexample to the approximation problem. To appear in Israel Journal of Mathematics.
5. Lindenstrauss, J., Rosenthal, H.P.: The scriptL p spaces Israel Journal of Mathematics7?8, 325?349 (1969?70).