1. Schwartz, L.: J. d'Analyse Mathématique (Jerusalem), XIII, 115 (1964).
2. Grossmann, A.: J. Math. Phys.6, 54 (1965).
3. Gel'fand, I. M., andN. Ya Vilenkin: Generalized Functions, Volume IV. Moscow: State Publishing House of Mathematical and Physical Literature 1961.
4. Riesz, F., andB. Sz-Nagy: Lecons d'analyse fonctionnelle. Budapest: Akademiai Kiado 1952.
5. Dunford, N., andJ. T. Schwartz: Linear operators I. New York: Interscience 1958.