Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Nomura Yasushi,Russell’s Paradox and the Theory of Propositional Functions in The Principles of Mathematics,Kagaku tetsugaku,02893428,"The Philosophy of Science Society, Japan",2012,46,1,17-33,https://cir.nii.ac.jp/crid/1390282680061271424,https://doi.org/10.4216/jpssj.46.1-17