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3. T. IKEDA: A Consideration Concerning the Selection of Samples (in Japanese),Research Memoir of the Institute of Statistical Mathematics, Vol. 5, No. 12, 1950.
4. H. MIDZUNO, T. HATORI, H. KIMURA & S. NISIHIRA: The Sampling Design for the Radio Listeners Survey (in Japanese with English abstract),The Research Report of the I.S.M., Number 1, 1950.
5. H. MIDZUNO: An outline of the Theory of Sampling Systems,Annals of the Institute of Statistical Mathematics, Vol. 3, No. 2, 1950.