Volkov, A. I.; Kologrieva, U. A.; Kovalev, natoly I.; Wainshtein, D. L.; Chizhov, P. S.; Seregina, I. F. Physico-Chemical Foundation of Sludge Processing Hydrometallurgical Production of Vanadium Pentoxide. Investigation of Forms of Vanadium Compounds. Kms 2020, 6, 299–303.