PN Ravindran, K, Nirmal Babu and K Sivaraman (2006) Turmeric- the Genus Curcuma. CRC Press, New York.
PN Ravibndran, K. Nirmal Babu, KN Shiva and Kallupurackal, J.A. (2006) Advances in Spices research, History and Achievements of Spices Research and Development in India since Independence, Agrobios, India.
PN Ravindran and K. Nirmal Babu (2005) Ginger- the genus Zingiber. CRC Press, New York
PN Ravindran, K. Nirmal Babu and M. Shylaja (2004) Cinnamon and Cassia-the Genus Cinnamomum, CRC Press, New York.
P.N.Ravindran and K.J. Madhusoodanan (2002) Cardamom, the Genus Elettaria. Taylor & Francis, London.
P.N. Ravindran & K. Nirmal Babu (2000) Black pepper, Piper nigrum, Harwood Academic , Amsterdam (CRC Press, N.York)
KL Chadha, PN Ravindran and Leela Shahjiram (2000) Biotechnology of Horticultural and Plantation crops, Malhotra Pub., New Delhi.

Descriptor: Descriptor for Piper nigrum, IBPGR, FAO.
Symposium Proceedings -4

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