G. U. Matevosyan, “Analogs of the $N\{\omega\}$ classes in the case of a circular annulus”, Mat. Zametki, 21:2 (1977), 173–182; Math. Notes, 21:2 (1977), 98–103
G. U. Matevosyan, “Uniform approximation by rational fractions of a special form”, Mat. Zametki, 17:3 (1975), 353–358; Math. Notes, 17:3 (1975), 203–206
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