1. K. O. Friedrichs:Mathematical Aspects of Quantum Field Theory (New York, 1953).
2. J. M. Cook:Trans. Am. Math. Soc.,74, 122 (1953).
3. L. Schwartz:Théorie des distributions,I,II (Paris, 1950);I. Halperin:Introduction to the Theory of Distributions (Toronto, 1952).
4. J. G. Valatin:Proc. Roy. Soc., (London),A 222, 93, 228 (1954);A 225, 535 (1954);A 226, 254 (1954);H. Lehmann, K. Symanzik undW. Zimmermann:Nuovo Cimento. 8, 205 (1954).
5. « Distributions tempérées»,L. Schwarz, l. c, Kap. VII, insbes. §, 3, 4.