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Sorption-Photometric Determination of Nickel and Cobalt Ions in Industrial Waste Using Diethyl 2,2’-(1,3,4-Thiadiazole-2,5- Diyl) Bis (Sulfandiyl) Diacetate Organic Reagent. Eura. Scie. Hera. 2023, 20, 64-67.