ASGHARZADA, Mahmood. Definition of Natural Languages Using Context-free Grammer: In Context of Dari Language. American International Journal of Social Science Research, [S. l.], v. 4, n. 2, p. 167–170, 2019. DOI: 10.46281/aijssr.v4i2.427. Disponível em: https://cribfb.com/journal/index.php/aijssr/article/view/427. Acesso em: 1 apr. 2025.