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MR 0290855
[3] Hill J. D.:
Remarks on the Boгel property. Pacif. J. Math. (1954), 227-242.
MR 0062244
[4] Garreau G. A.:
A Note on the Summation of Sequences of 0' and 1's. Annals of Math. (1951), 1, 183-185.
MR 0041951