1. G. Hardy, Divergent Series, Oxford University Press (1949).
2. V. I. Mel'nik, ?Tauberian theorems for the Valiron methods of summability,? Ukr. Mat. Zh.,30, No. 1, 110?114 (1978).
3. V. I. Mel'nik, ?Tauberian theorems for the Borel method of summability,? Izv. Vyssh. Ueheba. Zaved., Mat., No. 11, 85?92 (1971).
4. E. T. Whittaker and G. N. Watson, Advanced Calculus [Russian translation], Vol. 2, Fizmatgiz, Moscow (1963).
5. G. G. Lorentz, ?Tauberian theorems and Tauberian conditions,? Trans. Am. Math. Soc.,63, 226?234 (1948).