Korobiichuk, Valentyn, Volodymyr Shamrai, Oksana Iziumova, Oleksandr Tolkach, and Ruslan Sobolevskyi. 2016. “Definition of Hue of Different Types of Pokostivskiy Granodiorite Using Digital Image Processing”. Eastern-European Journal of Enterprise Technologies 4 (5(82):52-57. https://doi.org/10.15587/1729-4061.2016.74849.