1. Harborne JB (1977) Introduction to Ecological Biochemistry. Academic Press, New York
2. Hollis, CA, Smith JE and Fisher RF (1982) Allelopathic effects of common under storey species on germination and growth of southern pines. For Sci 28: 509–515
3. Holm G (1954) Chorophyll mutations in barley. Acta Agric Scand 4: 457–471
4. Kohli RK, Kaur Kanwaljit, Chaudhary Parveen, Kumari Anita and Saxena DB (1987) Negative aspects of Eucalyptus farming. Proc Workshop on Agroforestry for Rural Needs. Feb. 22–26, 1986, New Delhi. ISTS, Solan, India, 225–233
5. Melkania NP (1986) Allelopathy and its significance on production of agroforestry plant association. Proc Workshop of Agroforestry for Rural Needs. Feb. 22–26, 1986, New Delhi. ISTS, Solan, 211–224