Szkaradkiewicz, Anna K., and Janina Stopa. “Effect of Supernatants from Lactobacillus Acidophilus Culture on ATP Levels in Human Gingival Fibroblasts”. Current Issues in Pharmacy and Medical Sciences, vol. 26, no. 2, May 2013, pp. 140-3, https://doi.org/10.12923/j.2084-980X/26.2/a.04.