E. F. Sharaf, M. K. BouDagher-Fadel, J. (Toni) Simo, and A. R. Carroll, “A Revision of the Biostratigraphy and Strontium Isotope Dating of Oligocene-Miocene Outcrops in East Java, Indonesia”, BSED, vol. 30, no. 1, pp. 44–58, Aug. 2021.