4C. S. Okereke, E. O. Esu, A. E. Edet.Determination of potential groundwater sites using geological and geophysical techniques in the Cross River State, southeastern Nigeria [J].Journal of African Earth Sciences, 1998, 27(1):149-163.
5Zeil. Peter, Volk. Peter, Saradeth, et al.Geophysical methods for lineament studies in groundwater exploration[J].Geoexploration, 1991,27(1-2):165-177.