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4. A. A. Kondratyuk, Fourier series and Meromorphic Functions (Vyshcha Shkola, Lvov, 1988) [in Russian].
5. A. A. Gol’dberg and N. V. Zabolotskii, “Concentration index of a subharmomic function of zeroth order,” Mat. Zametki 34 (2), 227–236 (1983) [Math. Notes 34 (1–2), 596–601 (1984)].