A. Subramani and A. Krishnan
Ghandi F. Manasra and Mohammad M. Abu-Samreh
O.O. Ekabua , E.E. Williams , I. Eteng and R.C. Okoro
J. Premalatha , P. Balasubramanie and C. Venkatesh
P. Harini and O.B.V. Ramanaiah
S. Osunade and F.A. Atanda