“Use of Caprolactam to Enhance Iron Ion Adsorption by an Anthracite-Based Carbon Sorbent”. Sorbtsionnye I Khromatograficheskie Protsessy, vol. 25, no. 4, Nov. 2025, pp. 567-75, https://doi.org/10.17308/sorpchrom.2025.25/13284.