000 00314nam a2200121Ia 4500
008 220408s1983 xx 000 0 und d
041 _aeng
082 _a658
_b Por
100 _aPorter, Michael. E
_9485804
245 _aCases in Competitive Strategy
260 _aNew York
_b The Free Press
_c1983
300 _a541p
999 _c347999
_d347999