Goff, Randal D.; Gao, Ying; Mattner, Jochen; Zhou, Dapeng; Yin, Ning; Cantu III, Carlos; Teyton, Luc; Bendelac, Albert; Savage, Paul B. Journal of the American Chemical Society, 2004, vol. 126, # 42 p. 13602 - 13603 doi: 10.1021/ja045385q