Reshadat, Vahideh, and Heshaam Faili. “A New Open Information Extraction System Using Sentence Difficulty Estimation”. Computing and Informatics 38, no. 4 (December 30, 2019): 986–1008. Accessed November 7, 2024. http://147.213.75.17/ojs/index.php/cai/article/view/2019_4_986.