1. Blackwell, D., A renewal theorem, Duke Math. J., Vol. 15, 1948, pp. 145–150.
2. Blackwell, D., Extension of a renewal theorem, Pacific J. Math., Vol. 3, 1953, pp. 315–320.
3. Choquet, G. and Deny, J., Sur I’Equation de convolution
µ = µ * σ, C. R. Acad. Sci. Paris, Vol. 250, 1960, pp. 799–801.
4. Chung, K. L., On the renewal theorem in higher dimensions, Skand. Aktuarietidskr., Vol. 35, 1952, pp. 188–194.
5. Chung, K. L., and Fuchs, W, H. J., On the distribution of values of sums of random variables, Mem. Amer. Math. Soc., No. 6, 1951, pp. 1–12.