[1] King Fahd Univ Petr & Minerals, Dhahran 31261, Saudi Arabia
[2] Georgia Tech, Atlanta, GA USA
[3] Univ So Queensland, Toowoomba, Qld 4350, Australia
[4] Univ Calgary, Calgary, AB T2N 1N4, Canada
[5] Monash Univ Malaysia, Subang Jaya, Malaysia
[6] Anambra State Univ, Anambra, Nigeria
[7] Boston Coll, Chestnut Hill, MA 02167 USA