Y. Yokoyama, C. Falguères, F. c. S\'emah, T. Jacob, and R. Grün. Gamma-ray spectrometric dating of late Homo erectus skulls from Ngandong and Sambungmacan, Central Java, Indonesia. J. Hum. Evol., volume 55, issue 2, pages 274-277, August 2008.

Y. Kaifu, H. Baba, F. Aziz, E. Indriati, F. Schrenk, and T. Jacob. Taxonomic affinities and evolutionary history of the Early Pleistocene hominids of Java: dentognathic evidence. Am. J. Phys. Anthropol., volume 128, issue 4, pages 709-726, December 2005.

E. Delson, K. Harvati, D. Reddy, L. F. Marcus, K. Mowbray, G. J. Sawyer, T. Jacob, and S. M\'arquez. The Sambungmacan 3 Homo erectus calvaria: a comparative morphometric and morphological analysis. Anat. Rec., volume 262, issue 4, pages 380-397, April 2001.

E. Delson, K. Harvati, D. Reddy, L. F. Marcus, K. Mowbray, G. J. Sawyer, T. Jacob, and S. Márquez. The Sambungmacan 3 Homo erectus calvaria: a comparative morphometric and morphological analysis. Anat. Rec., volume 262, issue 4, pages 380-397, April 2001.

S. M\'arquez, K. Mowbray, G. J. Sawyer, T. Jacob, and A. Silvers. New fossil hominid calvaria from {Indonesia--Sambungmacan} 3. Anat. Rec., Wiley, volume 262, issue 4, pages 344-368, April 2001.