KAZMI, M.; YASIR, F.; HABIB, S.; HAYAT, M. S.; QAZI, S. A. Photometric Ligature Extraction Technique for Urdu Optical Character Recognition. Engineering, Technology & Applied Science Research, Greece, v. 11, n. 6, p. 7968–7973, 2021. DOI: 10.48084/etasr.4596. Disponível em: https://etasr.com/index.php/ETASR/article/view/4596. Acesso em: 6 jul. 2022.