Baigenzhenov О.S., Toishybek А.М., Khabiyev А.Т., I.O. Aimbetova, and Dagubayeva А.Т. 2021. “Recovery of Niobium from Wastes Generated in Titanium Production by Cation Exchange Sorbents”. Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources 318 (3):97-103. https://doi.org/10.31643/2021/6445.33.