1. Studies on the physiological effect of humic acid (Part 1). Uptake of humic acid by crop plants and its physiological effects;Aso;Soil Sci. Plant Nutr.,1963
2. Availability of calcium from soil solution organic compounds to plant (in Russian);Agapkina;Agrokhimiya,1988
3. Organic compounds of radionuclides in soil solutions and their role in uptake of elements to plants (in Russian);Agapkina;Ekologiya,1991
4. Uptake of iron from iron-organic complexes to plants (in Russian);Karpukhin;Izvestiya TSHA,1980
5. Studies on migration and transformation of iron in podzolic soils (in Russian);Karpukhin;Doklady TSHA,1980