Aleksandrov, A., D. Mollova, and I. Iliev. “Influence of Bioactive Substances from Ascophyllum Nodosum, Lycium Barbarum and Tribulus Terrestris on the Quality Characteristics of Human Spermatozoa”. Journal of BioScience and Biotechnology, vol. 9, no. 1, July 2020, pp. 11-16, https://editorial.uni-plovdiv.bg/index.php/JBB/article/view/289.