3-(2-PYRIDIL)-5-(2-HYDROXYPHENYL)-1,2,4-TRIAZOL AS A REAGENT FOR FLUORIMETRIC DETERMINATION OF MICRO-AMOUNTS OF ZINC: DOI: Https: doi.Org 10.17721 1728-2209.2019.1(56).1. Вісник: Хімія 2019, 56 (1), 6-9.