Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) BENIGNI JD,"The synthesis of 5,6-dihydroxyindole and some of its derivatives (1)",J Heterocycl Chem,,,1965,2,,387-392,https://cir.nii.ac.jp/crid/1570291225329229952,