Tomović, Savo, and Predrag Stanišić. “An Efficient Itemset Representation for Mining Frequent Patterns in Transactional Databases”. Computing and Informatics, vol. 37, no. 4, Nov. 2018, pp. 894-1, http://147.213.75.17/ojs/index.php/cai/article/view/2018_4_894.