Gaines, R. R., Hammarlund, E. U., Hou, X., Qi, C., Gabbott, S. E., Zhao, Y., . . . Canfield, D. E. (2012). Reply to Butterfield: Low-sulfate and early cements inhibit decay and promote Burgess Shale-type preservation. National Academy of Sciences.

Gaines, Robert R., Emma U. Hammarlund, Xianguang Hou, Changshi Qi, Sarah E. Gabbott, Yuanlong Zhao, Jin Peng, and Donald E. Canfield. Reply to Butterfield: Low-sulfate and Early Cements Inhibit Decay and Promote Burgess Shale-type Preservation. National Academy of Sciences, 2012.

Gaines, Robert R., et al. Reply to Butterfield: Low-sulfate and Early Cements Inhibit Decay and Promote Burgess Shale-type Preservation. National Academy of Sciences, 2012.