1. W. Feller, An Introduction to Probability Theory and Its Applications. Vol. 2, Wiley, New York (1966).
2. G. Polya, “Herleitung des Gausschen fchlergesetzes aus einer functionalgleichung,” Math. Zeitschrift, B.18, 96–108 (1923).
3. M. L. Eaton, “Characterization of distributions by identical distribution of linear forms,” J. Appl. Probab., 3, 481–494 (1966).
4. N. Gouillon, “Explicit lower bounds for linear forms in two logarithms,” J. Théorie des nombres Bordaux (to appear) (see http://iml.univ-mrs.fr/∼gouillon/linear-forms.pdf ).
5. O. Yanushkevichiene, “Stability estimation of one characterization of exponential distribution,” Teor. Veroyatn. Primen., 29, No. 2, 281–292 (1985).