Mai, H. D., and ChuD. Q. “Sequence Stratigraphy and Determination of Early Miocene - Oligocene Sedimentation Environments of Block 09-3 in Cuu Long Basin Based on the Characteristics of Freshwater Dinocyst Groups and Palynofacies Analysis”. Petrovietnam Journal, Vol. 7, Aug. 2015, pp. 24 -32, https://pvj.vn/index.php/TCDK/article/view/535.