Zhang, H.; Wang, M.; Liu, X. (2008). «Constraints on the upper boundary age of the Tiaojishan Formation volcanic rocks in West Liaoning-North Hebei by LA-ICP-MS dating». Chinese Science Bulletin. 53 (22): 3574–3584. Bibcode:2008SciBu..53.3574Z. doi:10.1007/s11434-008-0287-4
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Zhang, H.; Wang, M.; Liu, X. (2008). «Constraints on the upper boundary age of the Tiaojishan Formation volcanic rocks in West Liaoning-North Hebei by LA-ICP-MS dating». Chinese Science Bulletin. 53 (22): 3574–3584. Bibcode:2008SciBu..53.3574Z. doi:10.1007/s11434-008-0287-4