00261nam a2200097Ia 4500008004100000041000800041100003200049245004700081260002700128300000800155240521s2008    xx            000 0 und d  aeng  aCUMBERS A. AND MACKINNON D.  aCLUSTERS IN URBAN AND REGIONAL DEVELOPMENT  bROUTLEDGE CANADAc2008  a140