“AMPEROMETRIC TITRATION OF PERRHENATE-IONS BY METHYL VIOLET AND CRYSTAL VIOLET ORGANIC BASIC DYES”, Proc. YSU B: Chem. Biol. Sci., vol. 38, no. 1 (203), pp. 71–75, Dec. 2003, doi: 10.46991/PYSUB.2004.38.1.071.