Babuponnusami A., Velmurugan S., and Sundararaman T.R. “Effect of Pore Size Distribution on Methane Storage at Low Pressure: Preparation of Activated Carbon for ANG Storage”. International Journal of Research in Chemistry and Environment (IJRCE), vol. 1, no. 1, June 2011, pp. 135-41, https://ijrce.org/index.php/ijrce/article/view/68.