Sivashankar, Pathmanathan, Jeevika Weerahewa, Gamini Pushpakumara, and Lakshman Galagedara. 2016. “An Estimation of the Willingness to Pay for Biodiesel: A Pilot Study of Diesel Consumers”. Bio-Based and Applied Economics 5 (1):27-45. https://doi.org/10.13128/BAE-15283.