Xu J., S. Kaspari, S. Hou, S. Kang, D. Qin, J. Ren, P. Mayewski. (2009). Records of volcanic events since AD 1800 in the East Rongbuk ice core from Mt. Qomolangma. Chinese Science Bulletin. 54, Doi: 10.1007/s11434-009-0020-y.