Too Long; Didn't Read

There are very few research-based approaches for cross-border interoperable identity systems. Shibboleth is the de facto standard for identity management and point of access to providers of information (PAPI) as a solution that leverages the joining of federations during cross-federation authentication and authorization (AA) sessions.

The #1 Publication focused solely on Interoperability. Publishing how well a system works or doesn't w/ another system.