MUTUAL COORDINATION OF SYSTEMS BASED ON POLYMERIC STRUCTURES OF RARE-EARTH METAL IONS AND RATIONALE FOR THE STUDIES MUTUAL COORDINATION OF SYSTEMS BASED ON POLYMERIC STRUCTURES OF RARE-EARTH METAL IONS AND RATIONALE FOR THE STUDIES. ВНЮК 2025, No. 2, 17-22. https://doi.org/10.54251/2616-6429.2025.02.0003nu.