European Patent EP-1679562 B1 German patent DE-602005001685 T2 (Translation of European Patent EP-1679562B1 published in German Patent Bulletin N° 35 of 30th August 2007) European Patent EP-1597636 B1
German patent DE-602004004087 T2
(Translation of European Patent EP-1597636B1 published in German Patent Bulletin N° 20 of 16th May 2007)