Business methods
- http://www.michaelgeist.ca/2009/06/business-method-patent-column-post/
- http://www.uspto.gov/patents-getting-started/patent-basics/types-patent-applications/utility-patent/patent-business
- https://en.wikipedia.org/wiki/Business_method_patent
- http://nosoftwarepatents.wikidot.com/amicus
- http://www.groklaw.net/staticpages/index.php?page=2009022607324398
- http://wiki.ffii.fr/wakka.php?wiki=AffaireBilski