Verdier, L., Sakhaii, P., Zweckstetter, M., & Griesinger, C. (2003). Measurement of long range H,C couplings in natural products in orienting media: a tool for structure elucidation of natural products. Journal of Magnetic Resonance, 163(2), 353-359. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WJX-48TMFH0-1-48&_cdi=6890&_user=38661&_pii=S1090780703000636&_orig=search&_coverDate=08%2F31%2F2003&_sk=998369997&view=c&wchp=dGLzVzb-zSkWA&md5=b4c489e787b0cf34620dcab2da99bce5&ie=/sdarticle.pdf.