1. Effect of the nature of buffer solutions on the biological activity of soil enzymes;Abramyan;Biologichesku Zhurnal Armenu,1975
2. Phosphatase activity and phosphorus availability in the rhizosphere of corn roots;Boero,1979
3. Phosphodiesterase activity of soils;Browman,1978
4. Urease activity in soils;Bremner,1978
5. Enzyme activity in soils at subzero temperature;Bremner;Soil Biology & Biochemistry,1975