German, Laura, Ariane Goetz, Tim Searchinger, Gustavo L.T. Oliveira, Julia Tomei, Carol Hunsberger, and Jes Weigelt. 2017. “Sine Qua Nons of Sustainable Biofuels: Distilling Implications of under-Performance for National Biofuel Programs”. Energy Policy 108: 806-17. doi:10.1016/j.enpol.2017.04.013.

Goetz, Ariane, Tim Searchinger, Tim Beringer, Laura German, Ben McKay, Gustavo L.T.Oliveira, and Carol Hunsberger. 2018. “Reply to Commentary on the Special Issue Scaling up Biofuels? A Critical Look at Expectations, Performance and Governance”. Energy Policy 118: 658-65. doi:10.1016/j.enpol.2018.03.046.