1. Sources of humic substances in soil;Alexandrova;Trans. Leningrad Agric. Inst.,1970
2. Biological Productivity of Ecosystems of North Eurasia;Bazilevich,1993
3. Developing of the statistical weather simulator;Belchenko;Sci. Eng. Bull. Agric. Phys.,1989
4. Decomposition rate and chenical changes of Scots pine litter. I. Influence of stand age;Berg;Ecol. Bull. Stockholm,1980
5. Decomposition rate and chemical changes of Scots pine litter. II. Influence of chemical composition;Berg;Ecol. Bull. Stockholm,1980