TY - RPRT TI - Theoretical models of heterogeneous media for electrical prospecting methods with direct currents AU - Sabba S. Stefanescu AU - Adel A. R. Zohdy PY - 1995 DO - 10.3133/ofr95544 UR - https://pubs.usgs.gov/publication/ofr95544 ID - ofr95544 ER -