9Ares A, James H F. 2000. Productivity, nutrient and water-use efficiency of Eucalyptus asligna and Toona ciliata in Hawaii. Forest Ecology and Management. 139:227 - 236
10Gupta S K. 1972. Energy structure of standing crop in certain grasslands at Gyanpur. Trop Ecol, 13 : 147- 155