George A. Olah; G. K. Surya Prakash; Alain Goeppert. Chemical Recycling of Carbon Dioxide to Methanol and Dimethyl Ether: From Greenhouse Gas to Renewable, Environmentally Carbon Neutral Fuels and Synthetic Hydrocarbons. J. Org. Chem.. 2009, 74 (2): 487–498. PMID 19063591. doi:10.1021/jo801260f.
George A. Olah; G. K. Surya Prakash; Alain Goeppert. Chemical Recycling of Carbon Dioxide to Methanol and Dimethyl Ether: From Greenhouse Gas to Renewable, Environmentally Carbon Neutral Fuels and Synthetic Hydrocarbons. J. Org. Chem.. 2009, 74 (2): 487–498. PMID 19063591. doi:10.1021/jo801260f.