Michiharu Kudo et.al., XML Access Control, www.trl.ibm.com/projects/xml/xacl/xmlac-proposal.html. An excellent introduction into XML Access Control
http://www.cs.princeton.edu/~sudhakar/papers/memerr-slashdot-commentary.html
http://www.cs.princeton.edu/~sudhakar/papers/memerr.pdf
http://www.cs.princeton.edu/~sudhakar/talks/memerr-slides.pdf
Implementing SELinux as a Linux Security Module by Stephen Smalley, Chris Vance and Wayne Salamon. Implementation details and short overview.
Setuid and symlink problems on Unix/Linux: Linux Magazin 04/05 pg. 64ff. "Wurzelbehandlung"
Thorvalds/Tanenbaum debate on micro-kernals, 2nd round with an emphasis on security and reliability