Hiromi BAN; Hidetaka NAMBO; Takashi OYABU. Determining the Relative Difficulty of English Writings by Fuzzy Reasoning and Its Application to Selecting Teaching Materials. Modern Perspectives in Language, Literature and Education Vol. 9, [S. l.], p. 1–12, 2021. DOI: 10.9734/bpi/mplle/v9/1872C. Disponível em: https://stm.bookpi.org/MPLLE-V9/article/view/3592. Acesso em: 21 jul. 2026.