Doan Ngoc, S. and Nguyen Thi Hai, H. 2019. Application of vertical electricalsounding (VES) and Electromagnetic (EM) methods to study shallow geological structures for inspection of gas pipeline foundation . Petrovietnam Journal. 8, (Aug. 2019), 44-49. DOI:https://doi.org/10.25073/petrovietnam journal.v8i0.164.