D. N. Konshina, V. V. Konshin, DzhenlodaR. Н., V. M. Shkinev, T. V. Danilova, and V. K. Karandashev, “Synthesis and characterization of silica covalently immobilized with azohydrazon (formazan) groups for recovery of noble metals”, sorpchrom, vol. 14, no. 3, Nov. 2019.