00314nam a2200121Ia 4500008004100000041000800041082001200049100002100061245001900082260004800101300003200149365001100181240624s9999    xx            000 0 und d  aeng  a382 POR  aPORTER MICHAEL E  aON COMPETITION  c2008aBostonbHarvard Business School Press  axxxi, : 544 : p. : cm. ; 23  cRSb30