@book{112084, author = {Varian, Hal R. and Farrell, Joseph}, title = {The Economics of Information Technology: An Introduction}, publisher = {CUP}, year = {2004}, address = {Cambridge}, url = {http://isical.cambridge.patron.eb20.com/Collections/ViewBook/48651a32-acac-4367-9f67-9ec7a7d0001b} }