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By W.N. Cottingham, D.A. Greenwood. Noel Cottingham is a theoretician working in the HH Wills Physics Laboratory at the University of Bristol. Derek Greenwood is a theoretician working in the HH Wills Physics Laboratory at the University of Bristol.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.