L. V. Mikayelyan, N. Sedrakyan, “On Periodicity of Sums of Periodic Functions”, Math. Ed., 2000, Issue 2(13),Pages <nobr>29

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Math. Ed., 2000 Issue 2(13), Pages 29–33 (Mi mo260)

Students and teachers of secondary school

On Periodicity of Sums of Periodic Functions

L. V. Mikayelyan, N. Sedrakyan