Шамрай, Володимир Ігорович, and Валентин Вацлавович Коробийчук. 2014. “Influence of Grinding-Polishing of Natural Stone on Its Shine and Lightness Shades”. Eastern-European Journal of Enterprise Technologies 5 (5(71):56-60. https://doi.org/10.15587/1729-4061.2014.28036.