Livshits, V. A., Kurad, D., & Marsh, D. (2006). Multifrequency simulations of the EPR spectra of lipid spin labels in membranes. Journal of Magnetic Resonance, 180, 63-71. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WJX-4J5C825-1-29&_cdi=6890&_user=38661&_orig=search&_coverDate=05%2F31%2F2006&_sk=998199998&view=c&wchp=dGLbVtz-zSkWz&md5=b733b30b33f90ce3c98e869a772c284f&ie=/sdarticle.pdf.