Indriati, Etty, Swisher, Carl C., III, Lepre, Christopher, Quinn, Rhonda L., Suriyanto, Ruswad A., Hascaryo, Agus T., Feibel, Craig S., Pobiner, Briana L., Auber, Maxime, Lees, Wendy, and Antón, Susan C. 2012. "The age of the 20 meter Solo River Terrace, Central Java, Indonesia, and the survival of Late Homo erectus in Asia." PLoS ONE, 6, (6) e21562. https://doi.org/10.1371/journal.pone.0021562.