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The information added by "67.173.6.201" is quite useful but it lacks reliable sources. The references that have been added by this contributor thus far - Stack Exchange answers - are not acceptable unfortunately. Websites whose content is largely user-generated, like most wikis including Wikipedia, and other collaboratively created websites, which Stack Exchange is, are not trustworthy. A fair point in that sense was made here. Serge10duke (talk) 11:13, 6 December 2016 (UTC)[reply]

There's a lot of content with only 3 references, please consider adding more. One could use Google Scholar to find reliable materials that can be referenced. Serge10duke (talk) 11:13, 6 December 2016 (UTC)[reply]

A critique of the ABAC model should be considered as well; please see Wikipedia:Criticism for Wikipedia's neutral point of view policy. Serge10duke (talk) 11:13, 6 December 2016 (UTC)[reply]