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GEORGIEVA, Lora, ŻOŁĄDKIEWICZ, Katarzyna and ŻUKOW, Walery. Vitamin D concentration effect in health care and sport performance. Pedagogy and Psychology of Sport. Online. 31 March 2018. Vol. 4, no. 2, pp. 53-70. [Accessed 23 June 2024]. DOI 10.12775/PPS.2018.010.