Pawlicka, M., U. Fałkowska, K. Bałabuszek, A. Radzka, A. Mroczek, and J. Bednarski. “Vitamin D and Hypertension”. Journal of Education, Health and Sport, vol. 8, no. 9, Aug. 2018, pp. 219-28, https://apcz.umk.pl/JEHS/article/view/5823.