Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SUMOTO Misao and ISOZAKI Tesshyo,Syntheses of Some Polyamides and Polyureas Containing the Piperazine Ring,"The Journal of the Society of Chemical Industry, Japan",00232734,The Chemical Society of Japan,1965,68,10,1989-1994,https://cir.nii.ac.jp/crid/1390001205123138048,https://doi.org/10.1246/nikkashi1898.68.10_1989