Sethi Sapna, Kothiyal N.C., and Nema Arvind K. “Preferential Flow in Landfill Simulating Reactors”. International Journal of Research in Chemistry and Environment (IJRCE), vol. 1, no. 2, Sept. 2011, pp. 216-21, https://ijrce.org/index.php/ijrce/article/view/112.