Refaat Atalla Ahmed Abohassan, Clement Akais Okia, Jacob Godfrey Agea, James Munga Kimondo and Morag M. McDonald
Environmental Research Journal 6 ( 1 ): 22 - 31 , 2012
James Munga Kimondo, Clement Akais Okia, Jacob Godfrey Agea, Refaat Atalla Ahmed Abohassan, Jackson Mulatya and Zewge Teklehaimanot
Research Journal of Applied Sciences 6 ( 3 ): 153 - 162 , 2011