RU
Izuchenie gumusa. CHast' III. Ehkstrakcija organicheskih soedinenij iz mineral'nyh pochv kompleksirujushhimi rastvorami NaF, (NH4)2F2, Na4P2O7, Na2C2O4
EN
Investigations on humus. Part III. Extraction of organic compounds from mineral soils with complexing solutions NaF, (NH4)2F2, Na4P2O7, Na2C2O4