[1] BROMWICH T. J. I'A.: An Introduction to the Theory of Infinite Series. 2nd ed., London 1926.

[2] BANERJEE C. R., LAHIRI B. K.: On subseгies of divergent series. Amer. Math. Monthly, 71, 1964, 767-768. MR 0166511

[3] KAKEYA S.: On the paгtial sums of an infinite series. Science Reports of the Tôhoku Imperial University (1), 3, 1914, 159-163.

[4] MINÁČ J.: O hustote hodnôt istých aritmetických funkcií. In: Matematické obzoгy 12, 1978, 41-45.

[5] ŠALÁT T.: On subseries of divergent series. Mat. Čas., 18, 1968, 312-338. MR 0252890 | Zbl 0169.07201