Altair Oivo Santin,  Edgard Jamhour,  Emir Toktar,  Emerson Ribeiro de Mello. 

This work presents a proposal of extension to the model of Role-Based Access control (RBAC) to support activities that demands mutability in their authorization attributes in runtime. Such activities cannot be subdivided in a set of subtasks executed sequentially and nor they can be accomplished by a single role. The presented approach allows the creation of quorum role, which can only be activated in a session with endorsement of a quorum of other roles.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2006/sc1_1.pdf

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