no. 3
Dense sums
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 17 (1972) no. 3, pp. 195-219. 
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Fano, G.; Gallavotti, G. Dense sums. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 17 (1972) no. 3, pp. 195-219. http://www.numdam.org/item/AIHPA_1972__17_3_195_0/

[1] G. Fano and G. Loupias, Comm. Math. Phys., vol. 20, 1971, p. 143. | MR

[2] H. Börner, Darstellungen von Gruppen Springer Verlag, Berlin, 1955, p. 28; see also F. Smithies, Duke Math. J., vol. 8, 1941, p. 107. | Zbl

[3] R.L. Dobrushin and R.A. Minlos, Theor. Prob. Appl., vol. 12, 1967, p. 535

[4] R.P. Boas, Entire functions, Academic Press, 1954, p. 24, Theorem 2.8.2. | MR | Zbl

[5] G. Fano and G. Loupias, Ann. Inst. H. Poincaré, Vol. XV, N° 2, 1971, p. 91. | Numdam | Zbl

[6] N. Dunford and J.T. Schwartz, Linear Operators, Interscience Publ., Vol I, 1964, Theorem IV. 9.15, p. 316.