User:Asoknack
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.120.4319&rep=rep1&type=pdf
http://portal.acm.org/citation.cfm?id=224076
http://portal.acm.org/citation.cfm?id=219284
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.61.5054&rep=rep1&type=pdf
http://portal.acm.org/citation.cfm?id=224076
http://portal.acm.org/citation.cfm?id=268998.266644&coll=GUIDE&dl=GUIDE&CFID=104701711&CFTOKEN=65527198