• Economic and Game Theory Against Intellectual Monopoly - Michele Boldrin, David K. Levine (2007)
• bitlaw.com
• iusmentis.com
• stopsoftwarepatents.org
• endsoftpatents.org
• nosoftwarepatents.com
• ffii.org
• fsfe.org
• eff.org
• xiph comments on patents
• illegal number [wikipedia]