A Comprehensive Study of Local, Global, and Combined Optimization Methods on Synthetic Seismic Refraction and Direct Current Resistivity Data oleh Paul Edigbue, Ismail Demirci, Irfan Akca, Hamdan Ali Hamdan, Panagiotis Kirmizakis, Pantelis Soupios, Emin Candansayar, Sherif Hanafy, Abdullatif Al-Shuhail