Henry Ogbuagu, Dike. “In Situ Yields in Primary Productivity of Sand Mine Ponds of the Otamiri River in a Southeastern City of Nigeria”. Scientific Journal of Environmental Sciences 2, no. 4 (July 25, 2013): 84-92. Accessed July 22, 2024. http://sjournals.com/index.php/sjes/article/view/1260.