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: Nobe-gosû to Kotonari-gosû to no kankei (A functional relation between the numbers of different words and running words). Keiryô Kokugogaku (Mathematical Linguistics), No.3 (1957), pp. 1-15. Supplement, No. 12 (1960), pp. 4-6.
: Outline of a method for the quantitative analysis of writing vocabularies. British Journal of Psychology, Vol. 8 (1915) (By information from Yasumoto).
(Yoshinori) : Hyôhon kotonari-gosû no bunpu (Concerning the distribution of the numbers of different words in samples). Keiryô Kokugogaku (Math. Ling.), No. 13 (1960), pp. 38-50.
(Yoshinori) : Tôkei rikigaku to goi no tôkei (Statistical mechanics and statistics of vocabulary). Keiryô Kokugogaku (Math. Ling.), No. 14 (1960), pp. 13-33.