For Tuesday, April 6th:

• Hitz, D., Allison, B., Borr, A., Hawley, R., and Muhlestein, M. 1998. Merging NT and UNIX filesystem permissions. In Proceedings of the 2nd Conference on USENIX Windows NT Symposium - Volume 2 (Seattle, Washington, August 03 - 04, 1998). USENIX Association, Berkeley, CA, 10-10.
  www.usenix.org/.../hitz.html
  

For Friday, April 9th:

• MS Miller, K.-P. Yee, and JS Shapiro. Capability Myths Demolished. Technical Report SRL2003-02, Systems Research Laboratory, Department of Computer Science, Johns Hopkins University, Mar 2003
  http://srl.cs.jhu.edu/pubs/SRL2003-02.pdf

For the second reference, you may be interested in these reviews:
http://www.eros-os.org/pipermail/cap-talk/2003-March/001133.html