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• [2] Mahlon M. Day, Means for the bounded functions and ergodicity of the bounded representations of semi-groups, Trans. Amer. Math. Soc. 69 (1950), 276–291. MR 44031, https://doi.org/10.1090/S0002-9947-1950-0044031-5
• [3] Jacques Dixmier, Les moyennes invariantes dans les semi-groupes et leurs applications, Acta Sci. Math. (Szeged) 12 (1950), 213–227 (French). MR 37470
• [4] M. G. Kreĭn and M. A. Rutman, Linear operators leaving invariant a cone in a Banach space, Amer. Math. Soc. Translation 1950 (1950), no. 26, 128. MR 0038008

Bibliography

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P. Civin and B. Yood, Invariant functionals, Pacific J. Math. vol. 6 (1956) pp. 231-238. MR 0080274 (18:221b)

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M. M. Day, Means for the bounded functions and ergodicity of the bounded representations of semi-groups, Trans. Amer. Math. Soc. vol. 69 (1950) pp. 276-291. MR 0044031 (13:357e)

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J. Dixmier, Les moyennes invariantes dans les semi-groupes et leurs applications, Acta Sci. Math. Szeged vol. 12 Part A (1950) pp. 213-227. MR 0037470 (12:267a)

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M. G. Kreĭn and M. A. Rutman, Linear operators leaving invariant a cone in a Banach space, Amer. Math. Soc. Translations, no. 26, 1950. MR 0038008 (12:341b)