WIPO Patent WO/2008/043341 17 April 2008 https://www.google.com.ar/patents/WO2008043341A1?cl=de&dq=WO/2008/043341&hl=de&sa=X&ei=dHuZU9PACOyS7AaFj4CICg&ved=0CBkQ6AEwAA
