Incremental Crawl Vs Full Crawl

http://praveenkasireddy.wordpress.com/2013/10/04/sharepoint-search-full-vs-incremental-crawl/

http://sannadisarath.blogspot.in/2011/03/incremental-crawl-vs-full-crawl.html

http://kancharla-sharepoint.blogspot.in/2013/06/sharepoint-full-crawl-vs-incremental.html