Sven Ove Hansson: Review of Deontic Logic in Computer Science: Normative System Specification, John-Jules Ch. Meyer and Roel J. Wieringa (eds.), John Wiley & Sons, Chichester 1993. 249-251
Jürgen Dix: Review of Nonmonotonic Logic by W. Marek and M. Truszscynski, Springer, 1993. 251-253