Umeghalu, I.C.E., E.I.U. Nwuba, D.O. Onukwuli, I.F. Okonkwo, and J.O. Ngini. 2015. “Kinetics of Biogas Production from Fermentation Broth of Wild Cocoyam Codigested With Cow Paunch in Batch Mode”. Pure and Applied Science Advances 4 (3):98-104. http://sjournals.com/index.php/sjpas/article/view/463.