On the fundamental operations of collectives Kameo Matusita OriginalPaper 01 December 1950 Pages: 5 - 11
On a relation between exponential law and Poisson’s law Seiji Nabeya OriginalPaper 01 December 1950 Pages: 13 - 16
A note on the classification of observation data Hirojiro Aoyama BriefCommunication 01 December 1950 Pages: 17 - 19
On the quantification of qualitative data from the mathematico-statistical point of view Chikio Hayashi OriginalPaper 01 December 1950 Pages: 35 - 47
