Koizumi, Rie. “Relationships Between Text Length and Lexical Diversity Measures: Can We Use Short Texts of Less Than 100 Tokens?”. Vocabulary Learning and Instruction 1, no. 1 (December 31, 2012): 60–69. Accessed September 16, 2026. https://www.castledown.com/journals/vli/article/view/vli.v01.1.koizumi.