Organic Retopology Theory

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THR-42HXB35-33&_user=10&_coverDate=12%2F31%2F1980&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1506058104&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=8bc6552c1221eaa04061df55c667d0ac&searchtype=a

http://www.3d-coat.com/retopology-auto-retopology-manual-retopology-tools/