He migh have used this one http://www.stanford.edu/group/cslipublications/cslipublications/cover/Ferrario-cover-web.jpg ? Seems to be also mirrored.
He migh have used this one http://www.stanford.edu/group/cslipublications/cslipublications/cover/Ferrario-cover-web.jpg ? Seems to be also mirrored.