In russian: гумус.
CONTENT AND NATURE OF LEAD DISTRIBUTION IN THE FOOTHILL DAGHESTAN SOILS // Issue 51, P. 56 - 61.
MAGOMEDALIEV Zairbek Guseynovich
SAIDOV Abdulmutalim Kuruvovich
MIRZOEV Enver Magomed-Rasulovich
SALIKHOV Shamil Kuramagomedovich
YAHIYAEV Magomedpazil Atagishievich
AKHMEDOVA Zaira Nazhmutdinovna