Belyaeva, G.L. 2016. “MICRO (MATSERALNY) COMPOSITION OF ORGANIC MATTER HUMUS YARUDEYSKIY PARAMETRIC WELLS 38”. Perm Federal Research Centre Journal, no. 3 (January): 20-25. https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2015n3p3.