Mai Hoang Dam, Bui Thi Ngoc Phuong, Truong Tuan Anh, Nguyen Thi Thanh Nga, Tran Duc Ninh, Vu Thi Tuyen, Cao Quoc Hiep, Nguyen Van Su, Nguyen Thi Tham and Phan Van Thang 2021. Characteristics of Oligocene sediments in Block 05-1(a), Nam Con Son basin. Petrovietnam Journal. 2, (Feb. 2021), 4 - 15. DOI:https://doi.org/10.47800/PVJ.2021.02-01.