Ways and Tools to Improve the Efficiency of Natural Resources in Ukraine. (Management Mechanisms and Means of Hydrogen Sulfide Mixture Processing into the Black Sea) - B. M. Andrushkiv; O. I. Hahaliuk; N. B. Kyrych; O. B. Pohaidak; A. V. Cherep; R. P. Sherstiuk (Herald of the Economic Sciences of Ukraine, 2021)