Стеценко, В’ячеслав Валерійович, and Валерія Валеріївна Зайченко. 2019. “Study of Mineralogical Variability of Ferruginous Quartzites of Productive Strata of the Eastern Wing of the Petrovsky Synclinal Fold With Using Diagram Mm-Mo”. Visnyk of V. N. Karazin Kharkiv National University, Series "Geology. Geography. Ecology", no. 50 (July), 54-62. https://doi.org/10.26565/2410-7360-2019-50-04.