00269nam a2200097Ia 4500008004100000100002200041245003600063245002200099260000900121856004100130160531s9999    xx            000 0 und d  a Birkar, Caucher.  aLectures on Birational Geometry  cby Caucher Birkar  c2012  uhttp://arxiv.org/pdf/1210.2670v1.pdf