by Wahab, S.M.Abdel, Ahmed, M.A., Radwan, F.A., Hassan, R.M., El-Refae, A.M.
Published in Materials letters (01.02.1997)

by Salih, S.Y., Mustafa, D., Wahab, S.M.Abdel, Ahmed, M.A.M., Omer, A.
Published in Transactions of the Royal Society of Tropical Medicine and Hygiene (1977)