Balasubramanian, G. Research Group of Nanoscale Spin Imaging, MPI for biophysical chemistry, Max Planck Society;
http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TJH-4Y051M1-2-1M&_cdi=5311&_user=38661&_pii=S0022231309006012&_origin=browse&_coverDate=09%2F30%2F2010&_sk=998699990&view=c&wchp=dGLbVzb-zSkWA&md5=5f0e912162e4255ec6d4705f0693cadd&ie=/sdarticle.pdf (Publisher version)
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