by Taylor, H., Appleton, J.D., Lister, R., Smith, B., Chitamweba, D., Mkumbo, O., Machiwa, J.F., Tesha, A.L., Beinhoff, C.
Published in The Science of the total environment (01.05.2005)

by Kishe, M.A., Machiwa, J.F.
Published in Environment international (2003)

by Machiwa J.F, Hallberg R.O
Published in Ambio (01.12.1995)