00788cam 2200241 450 2396481http://id.bnportugal.gov.pt/bib/porbase/239648120050927150716.00-87584-863-XUSufpes002_bc.iso/03-11-2011/4656000474919990617d1999 m 0103 baengUSInformation rules<a >strategic guide to the network economyCarl Shapiro, Hal R. VarianBoston, MassachusettsHarvard Business School Presscop. 1999352 p.24 cmBibliografia, p. 329-334330.47BNporShapiroCarlVarianHal R.070PTUFPESRPC