A. MATEKEYEVA, M. MUXAMMADIYEVA, V. SAITQULOVA, and U. RUZMETOV, “DEVELOPMENT OF A HYBRID SORPTION–SPECTROSCOPIC SYSTEM BASED ON NITROSO-N-SALT IMMOBILIZED ON SILK FIBROIN FOR THE DETERMINATION OF Co(II) IONS”, NUUz, vol. 3, no. 3.3, pp. 327–330, Sep. 2026.