Idumah Okogwu, O. “Age, Growth and Mortality of Clarias Gariepinus (Siluriformes: Clariidae) in the Mid-Cross River-Floodplain Ecosystem, Nigeria”. Revista De Biología Tropical, vol. 59, no. 4, Dec. 2011, pp. 1707–1716, doi:10.15517/rbt.v59i4.3433.