KHALID, S.; KHUSRO, S.; ULLAH, I.; DAWSON-AMOAH, G. On The Current State of Scholarly Retrieval Systems. Engineering, Technology & Applied Science Research, Greece, v. 9, n. 1, p. 3863–3870, 2019. DOI: 10.48084/etasr.2448. Disponível em: https://www.etasr.com/index.php/ETASR/article/view/2448. Acesso em: 23 jan. 2022.