by Dawoud, U.M., El-Naggar, M.M.A.
Published in Journal of King Saud University. Engineering sciences (1996)

by Daous, M.A., Bashir, M.D., El-Naggar, M.M.A.
Published in International journal of hydrogen energy (1994)

by El-Masry, M.H, Mostafa, M.H, Ibrahim, A.M, El-Naggar, M.M.A
Published in FEMS microbiology letters (01.05.1995)