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    Total count: 10,000+ citations at Google Scholar.

    Two most cited papers in Access Control with 3000+ and 1000+ citations at Google Scholar.

  1. Seminal RBAC paper: R. Sandhu et al, Role-Based Access Control Models, IEEE Computer, 29(2):38-47, Feb. 1996,
    Google Scholar Search 3000+
  2. RBAC Standard paper: D. Ferraiolo, R. Sandhu et al, Proposed NIST Standard for Role-Based Access Control, ACM Trans. on Information and System Security (TISSEC), 4(3): 224-274, Aug. 2001,
    Google Scholar Search 1000+

    3. Papers with 400+ citations at Google Scholar.

  3. R. Sandhu et al, The ARBAC97 Model for Role-Based Administration of Roles, ACM Transactions on Information and System Security (TISSEC), 2(1): 105-135, Feb. 1999,
    Google Scholar Search 400+
  4. R. Sandhu and P. Samarati, Access Control: Principles and Practice, IEEE Communications, 32(9): 40-48, Sept. 1994,
    Google Scholar Search 400+

    5. Papers with 300+ citations at Google Scholar.

  5. R. Sandhu et al, The NIST Model for Role-Based Access Control: Towards A Unified Standard, Proc. 5th ACM Workshop on Role-Based Access Control, Berlin, July 26-28, 2000, pages 47-63,
    Google Scholar Search 300+
  6. R. Sandhu,  Lattice-Based Access Control Models, IEEE Computer, 26(11): 9-19, Nov. 1993,
    Google Scholar Search 300+
  7. S. Osborn, R. Sandhu and Q. Munawer. Configuring Role-Based Access Control to Enforce Mandatory and Discretionary Access Control Policies, ACM TISSEC, 3(2):85-106, May 2000.
    Google Scholar Search 300+

    8. Papers with 200+ citations at Google Scholar.

  8. G. Ahn and R. Sandhu. Role-Based Authorization Constraints Specification, ACM Transactions on Information & System Security (TISSEC), 3(4):207-226, Nov. 2000,
    Google Scholar Search 200+
  9. R. Sandhu, Role-Based Access Control, Adv. in Computers, 46:237-286, Academic Press 1998,
    Google Scholar Search 200+
  10. R. Thomas and R. Sandhu, Task-based Authorization Controls (TBAC): A Family of Models for Active and Enterprise-oriented Authorization Management, Proc. 11th IFIP WG11.3 Working Conference on Database and Application Security, Lake Tahoe, California, August 1997, pages 262-275.
    Google Scholar Search 200+

    11. Papers with 100+ citations at Google Scholar.

  11. R. Sandhu, The Typed Access Matrix Model, Proc. IEEE Symposium on Research in Security and Privacy, Oakland, California, May 1992, pages 122-136.
    Google Scholar Search 100+ ..
  12. Joon Park, Ravi Sandhu and Gail-Joon Ahn. Role-Based Access Control on the Web, ACM Transactions on Information and Systems Security (TISSEC), Volume 4, Number 1, February 2001.
    Google Scholar Search 100+
  13. Ezedin Barka and Ravi Sandhu. Framework for Role-Based Delegation Models, Proc. 16th Annual Computer Security Applications Conference, New Orleans, Louisiana, Dec. 11-15, 2000, pages 168-176.
    Google Scholar Search 100+
  14. Sushil Jajodia and Ravi Sandhu, Toward a Multilevel Secure Relational Data Model, SIGMOD 1991.
    Google Scholar Search 100+
  15. Jaehong Park and Ravi Sandhu. The UCON_ABC Usage Control Model, ACM Transactions on Information and System Security, Volume 7, Number 1, February 2004, pages 128-174.
    Google Scholar Search 100+
  16. Ravi Sandhu, Role Hierarchies and Constraints for Lattice-Based Access Controls, ESORICS 1996.
    Google Scholar Search 100+
  17. R. Sandhu, Role Activation Hierarchies, Proc. Third ACM Workshop on Role-Based Access Control, Fairfax, Virginia, October 22-23, 1998, pages 33-40.
    Google Scholar Search 100+
  18. Ravi Sandhu, Transaction Control Expressions for Separation of Duties, ACSAC 1988.
    Google Scholar Search 100+
  19. Ravi Sandhu, Cryptographic Implementation of a Tree Hierarchy for Access Control, Information Processing Letters, Volume 27, Number 2, February 1988.
    Google Scholar Search 100+
  20. Ravi Sandhu, Separation of Duties in Computerized Information Systems, IFIP11.3 1990.
    Google Scholar Search 100+
  21. Ravi Sandhu, The Schematic Protection Model: Its Definition and Analysis for Acyclic Attenuating Schemes , Journal of the ACM, Volume 35, Number 2, April 1988.
    Google Scholar Search 100+
  22. Jaehong Park and Ravi Sandhu, Towards Usage Control Models: Beyond Traditional Access Control, SACMAT 2002. Presentation
    Google Scholar Search 100+
  23. Ezedin Barka and Ravi Sandhu, A Role-Based Delegation Model and Some Extensions, NISSC 2000.
    Google Scholar Search 100+

    24. Papers with 50+ citations at Google Scholar.

  24. Gail-Joon Ahn and Ravi Sandhu, The RSL99 Language for Role-Based Separation of Duty Constraints, ACM RBAC 1999.
    Google Scholar Search 50+ ..
  25. Ravi Sandhu, Rationale for the RBAC96 Family of Access Control Models, ACM RBAC 1995.
    Google Scholar Search 50+
  26. Ravi Sandhu and Qamar Munawer, How to do Discretionary Access Control Using Roles, ACM RBAC 1998.
    Google Scholar Search 50+
  27. Ravi Sandhu, Edward Coyne, Hal Feinstein and Charles Youman, Role-Based Access Control: A Multi-Dimensional View, ACSAC 1994.
    Google Scholar Search 50+
  28. Ravi Sandhu and Sushil Jajodia, Polyinstantiation Integrity in Multilevel Relations, OAKLAND 1990.
    Google Scholar Search 50+
  29. Roshan Thomas and Ravi Sandhu, Conceptual Foundations for a Model of Task-based Authorizations, CSFW 1994.
    Google Scholar Search 50+
  30. Fang Chen and Ravi Sandhu, Constraints for Role-Based Access Control, ACM RBAC 1995.
    Google Scholar Search 50+
  31. Joon S. Park and Ravi Sandhu, Secure Cookies on the Web, IEEE Internet Computing, July 2000.
    Google Scholar Search 50+
  32. Ravi Sandhu and Qamar Munawer, The ARBAC99 Model for Administration of Roles, ACSAC 1999.
    Google Scholar Search 50+
  33. Gail-Joon Ahn, Myong Kang, Joon Park and Ravi Sandhu, Injecting RBAC to Secure a Web-Based Workflow System, ACM RBAC 2000.
    Google Scholar Search 50+
  34. Ravi Sandhu and P. Samarati, Authentication, Access Control and Audit, ACM Computing Surveys, 50th anniversary commemorative issue, Volume 28, Number 1, March 1996.
    Google Scholar Search 50+
  35. Ravi Sandhu and Fang Chen, The Multilevel Relational (MLR) Data Model, ACM Transactions on Information and Systems Security (TISSEC), Volume 1, Number 1,  June 1998.
    Google Scholar Search 50+
  36. Sejong Oh, Ravi S. Sandhu, A Model for Role Administration Using Organization Structure, SACMAT 2002.
    Google Scholar Search 50+
  37. Xinwen Zhang, Sejong Oh and Ravi Sandhu, PBDM: A Flexible Delegation Model in RBAC, SACMAT 2003.
    Google Scholar Search 50+
  38. Mohammad A. Al-Kahtani and Ravi Sandhu, A Model for Attribute-Based User-Role Assignment, ACSAC 2002.
    Google Scholar Search 50+
  39. Ravi Sandhu and P. Samarati, Authentication, Access Control and Intrusion Detection, The Computer Science and Engineering Handbook, CRC Press 1997.
    Google Scholar Search 50+
  40. Pete Epstein and Ravi Sandhu, Towards a UML Based Approach to Role Engineering, ACM RBAC 1999.
    Google Scholar Search 50+
  41. Joon S. Park and Ravi Sandhu, RBAC on the Web by Smart Certificates, ACM RBAC 1999.
    Google Scholar Search 50+
  42. Joon S. Park and Ravi Sandhu, Binding Identities and Attributes Using Digitally Signed Certificates, ACSAC 2000.
    Google Scholar Search 50+
  43. Elisa Bertino and Ravi Sandhu, Database Security-Concepts, Approaches, and Challenges. IEEE Trans. Dependable Sec. Comput. 2(1): 2-19, 2005.
    Google Scholar Search 50+
  44. Ravi Sandhu and Jaehong Park, Usage Control: A Vision for Next Generation Access Control, MMM-ACNS 2003.
    Google Scholar Search 50+
  45. Roshan Thomas and Ravi Sandhu, Towards a Task-Based Paradigm for Flexible and Adaptable Access Control in Distributed Applications, NSP 1993.
    Google Scholar Search 50+