Pehlivani, K., and A. Elshani. “Production of Diacetyl, Pentandion, Acetaldehyd, Etylacetate and Isoamylacetate With Different Yeast Concentration”. ANGLISTICUM. Journal of the Association-Institute for English Language and American Studies, vol. 4, no. 4, Dec. 2016, pp. 23-25, https://anglisticum.org.mk/index.php/IJLLIS/article/view/1220.