Ubul, Abdunabi, El-Sayed Atlam, Hiroya Kitagawa, Masao Fuketa, Kazuhiro Morita, and Jun-ichi Aoe. 2013. “An Efficient Method of Summarizing Documents Using Impression Measurements”. COMPUTING AND INFORMATICS 32 (2):371-91. https://www.cai.sk/ojs/index.php/cai/article/view/1626.