http://www.wipo.int/patentscope/search/en/detail.jsf;jsessionid=16FC77EF56BAFEF6159DF4F1D52CA7D9.wapp2?docId=WO2011057028&recNum=1&tab=PCTDocuments&maxRec=&office=&prevFilter=&sortOption=&queryString=
http://www.wipo.int/patentscope/search/en/WO2010009141
http://www.wipo.int/patentscope/search/docservicepdf_pct/id00000009782279?download