000 00328nam a2200109Ia 4500
008 231219s9999 xx 000 0 und d
041 _aeng
100 _aMichael E.Porter
245 _aCompetitive Strategy : Techniques for Analysing Industries & Compititors
260 _bThe Free Press ,NewYork /London
650 _aManagement
999 _c977662
_d977662