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Additional information
Crimean Astrophysical Observatory. Translated from Astrofizika, Vol. 13, No. 1, pp. 139–151, January–March, 1977.
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Lyubimkov, L.S. Variations in the helium abundance in associations and clusters of O and B stars. Astrophysics 13, 71–78 (1977). https://doi.org/10.1007/BF01003156
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DOI: https://doi.org/10.1007/BF01003156