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http://docs.oasis-open.org/xacml/30/xacml-30-core-spec-os-enpdf
. Accessed Sept 2018
2. AU2EU: Authentication and authorisation for entrusted unions (2015).
http://www.au2eu.eu/
. Accessed Sept 2018
3. WSO2 balana: The open source XACML 3.0 implementation (2015).
http://xacmlinfo.org/category/balana/
. Accessed Sept 2018
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