Jain, Sudhir Kumar, and Parmatma Singh. 1999. “Performance of Intercrops in Agroforestry System : The Case of Poplar (<I>Populus deltoides< I>) in Uttar Pradesh (India)”. Indian Forester 125 (2):195-205. https://doi.org/10.36808/if/1999/v125i2/5533.