G. Bruns, P. W. Fong, I. Siahaan, and M. Huth, Relationship-based access control, Proceedings of the second ACM conference on Data and Application Security and Privacy, CODASKY '12, pp.117-124, 2012.
DOI : 10.1145/2133601.2133616

B. Carminati, E. Ferrari, R. Heatherly, M. Kantarcioglu, and B. Thuraisingham, A semantic web based framework for social network access control, Proceedings of the 14th ACM symposium on Access control models and technologies, SACMAT '09, pp.177-186, 2009.
DOI : 10.1145/1542207.1542237

B. Carminati, E. Ferrari, and A. Perego, Rule-Based Access Control for Social Networks, OTM 2006 Workshops, pp.1734-1744, 2006.
DOI : 10.1007/11915072_80

B. Carminati, E. Ferrari, and A. Perego, Enforcing access control in Web-based social networks, ACM Transactions on Information and System Security, vol.13, issue.1, p.6, 2009.
DOI : 10.1145/1609956.1609962

Y. Cheng, J. Park, and R. Sandhu, Relationship-Based Access Control for Online Social Networks: Beyond User-to-User Relationships, 2012 International Conference on Privacy, Security, Risk and Trust and 2012 International Confernece on Social Computing, pp.646-655, 2012.
DOI : 10.1109/SocialCom-PASSAT.2012.57

Y. Cheng, J. Park, and R. Sandhu, A User-to-User Relationship-Based Access Control Model for Online Social Networks, DBSec 2012, pp.8-24, 2012.
DOI : 10.1007/978-3-642-31540-4_2

P. W. Fong, Relationship-based access control, Proceedings of the first ACM conference on Data and application security and privacy, CODASPY '11, pp.191-202, 2011.
DOI : 10.1145/1943513.1943539

P. W. Fong, M. Anwar, and Z. Zhao, A privacy preservation model for facebookstyle social network systems, ESORICS 2009, pp.303-320, 2009.

P. W. Fong and I. Siahaan, Relationship-based access control policies and their policy languages, Proceedings of the 16th ACM symposium on Access control models and technologies, SACMAT '11, pp.51-60, 2011.
DOI : 10.1145/1998441.1998450

C. Gates, Access control requirements for Web 2.0 security and privacy, 2007.

J. Golbeck and J. Hendler, Inferring binary trust relationships in Web-based social networks, ACM Transactions on Internet Technology, vol.6, issue.4, pp.497-529, 2006.
DOI : 10.1145/1183463.1183470

J. A. Golbeck, Computing and Applying Trust in Web-based Social Networks, 2005.

X. Jin, R. Krishnan, and R. Sandhu, A Unified Attribute-Based Access Control Model Covering DAC, MAC and RBAC, DBSec 2012, pp.41-55, 2012.
DOI : 10.1007/978-3-642-31540-4_4

S. R. Kruk, S. Grzonkowski, A. Gzella, T. Woroniecki, and H. Choi, D-FOAF: Distributed Identity Management with Access Rights Delegation, The Semantic Web?ASWC 2006, pp.140-154, 2006.
DOI : 10.1007/11836025_15

A. Masoumzadeh and J. Joshi, OSNAC: An Ontology-based Access Control Model for Social Networking Systems, 2010 IEEE Second International Conference on Social Computing, pp.751-759, 2010.
DOI : 10.1109/SocialCom.2010.116

J. Park, R. Sandhu, and Y. Cheng, ACON: Activity-Centric Access Control for Social Computing, 2011 Sixth International Conference on Availability, Reliability and Security, pp.242-247, 2011.
DOI : 10.1109/ARES.2011.42

J. Park, R. Sandhu, and Y. Cheng, A User-Activity-Centric Framework for Access Control in Online Social Networks, IEEE Internet Computing, vol.15, issue.5, pp.1562-65, 2011.
DOI : 10.1109/MIC.2011.30

H. Shen and F. Hong, An Attribute-Based Access Control Model for Web Services, 2006 Seventh International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT'06), pp.74-79, 2006.
DOI : 10.1109/PDCAT.2006.28

E. Yuan and J. Tong, Attributed based access control (ABAC) for Web services, IEEE International Conference on Web Services (ICWS'05), pp.561-569, 2005.
DOI : 10.1109/ICWS.2005.25