BAN, Hiromi; OGURI, Rei; KIMURA, Haruhiko. Difficulty-Level Classification for English Writings. Transactions on Engineering and Computing Sciences, [S. l.], v. 3, n. 3, p. 24, 2015. DOI: 10.14738/tmlai.33.1245. Disponível em: https://scholarpublishing.org/journals/index.php/TECS/article/view/2352. Acesso em: 6 may. 2026.