Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ole Buchardt and Christian L. Pedersen and Ulla Svanholm and A. M. Duffield and Alexandru T. Balaban and J. Cymerman Craig,"Seven-Membered Heterocyclic Rings. I. Formation of Substituted 4H-1,2-Diazepines from 2,4,6-Triarylpyrylium Salts and Hydrazine.",Acta Chemica Scandinavica,0904-213X,Danish Chemical Society,1969,23,,3125-3138,https://cir.nii.ac.jp/crid/1364233269999032192,https://doi.org/10.3891/acta.chem.scand.23-3125