SMANOVA, Z.; BOBOJONOV, B.; MADATOV, O.; RAXIMOV, S. EXPRESS TEST METHOD FOR THE DETERMINATION OF CHROMIUM (VI) IONS WITH TWO SODIUM SALTS OF IMMOBILIZED 1,8-DIOXYNAPHTHALENINE-3,6-DISULPHIC ACID. NUUz 2026, 3, 491-493.