Karim, M. A., N. Akhter, and S. Hoque. “Heterotrophic Activities in Eutrophic Lake Sediment by Indigenous Bacterium Bacillus Firmus”. Bangladesh Journal of Zoology, vol. 41, no. 1, May 2015, pp. 73-78, doi:10.3329/bjz.v41i1.23300.