Proceedings of the Malaysian Society of Soil Science Conference 2002 : Applications of Modern Tools in Agriculture: Perlis (Malaysia), 23-24 Apr 2002, p. 82-83
Enhancing Plant Productivity and Ecosystem Services in a Challenging Environment: Proceedings of the 20th Malaysian Society of Plant Physiology Conference 2009 (MSPPC 2009): Port Dickson, Negeri Sembilan (Malaysia), 24-26 Jul, 2009, p. 129-132