00717nam0-22002651i-450-990002615300403321000261530FED01000261530(Aleph)000261530FED0100026153020000920d--------km-y0itay50------baENGCases in competitive strategydi PORTER M ichaelNew YorkThe Free Presss.d.541 pp.28 cmPorter,Michael E.<1947- >5334ITUNINARICAUNIMARCBK9900026153004033214-0-385-TIs.i.ECAECACases in competitive strategy433362UNINAING01