by Siagi, Z.O., Mbarawa, M.
Published in Journal of hazardous materials (30.04.2009)

by Talai, S.M., Siagi, Z.O., Kimutai, S.K., Simiyu, S.S., Ngigi, W.T., Makokha, A.B.
Published in Research Journal of Applied Sciences, Engineering and Technology (05.07.2014)

by Siagi, Z.O., Mbarawa, M., Mohamed, A.R., Lee, K.T., Dahlan, I.
Published in Fuel (Guildford) (01.12.2007)