Ludvig, Lowemark, et al. “Biogenic Reworking of Tephra Layers in the South China Sea (Core MD972142) and the Celebes Sea (Core MD012388)”. Berita Sedimentologi, vol. 19, no. 1, Aug. 2021, pp. 31-41, doi:10.51835/bsed.2004.19.1.226.