Hiromi BAN; Rei OGURI; Haruhiko KIMURA. Study on Difficulty-Level Classification for English Writings. Current Research in Language, Literature and Education Vol. 4, [S. l.], p. 56–64, 2022. DOI: 10.9734/bpi/crlle/v4/3409E. Disponível em: https://stm.bookpi.org/CRLLE-V4/article/view/6157. Acesso em: 3 jun. 2026.