Arya, K., A. Rajagopalan, K. N. Satheesan, P. K. U. Nair, K. P. Mammotty, G. Zacharia, and T. Vanaja. “Panniyur-6 and Panniyur-7 - High Yielding Black Pepper Selections for Kerala”. INDIAN JOURNAL OF GENETICS AND PLANT BREEDING, vol. 63, no. 04, Nov. 2003, pp. 363-4, doi:.