URL's
http://www.vin.bg.ac.yu/VincaLaser/laser2.html
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJ5-4GHSGSC-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0244203bab2ee540da054f15d93c491b
http://cpc.cs.qub.ac.uk/summaries/ADVW
http://ntrs.nasa.gov/search.jsp?N=271+4294888726&Ntk=all&Ntx=mode%20matchall&Ntt=tea%2Bco2