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Usenko, I. A.; Kniazev, A. Y.; Katkov, I. Y.; Kovtyukh, V. V.; Mishenina, T. V.; Miroshnichenko, A. S.; Turner, D. G. SPECTROSCOPIC INVESTIGATIONS OF GALACTIC CLUSTERS WITH ASSOCIATED CEPHEID VARIABLES. IV. COLLINDER 220 AND UW CAR. Одес. астроном. публ. 2020, 33, 58-64.