@article {IOPORT.05418480,
    author       = {Fishburn, Peter C. and Odlyzko, Andrew M. and Siders, Ryan C.},
    title        = {Fixed fee versus unit pricing for information goods: Competition, equilibria, and price wars.},
    year         = {1997},
    journal      = {First Monday},
    volume       = {2},
    number       = {7},
    issn         = {1396-0466},
    publisher    = {Internet},
    identifier   = {05418480},
}