Christoph Beierle Jochen Dörre Udo Pletat Claus-Rainer Rollinger Peter H. Schmitt Rudi Studer The Knowledge Representation Language L<sub>LILOG</sub>. 14-51 1988 conf/csl/1988 CSL db/conf/csl/csl88.html#BeierleDPRSS88 http://dx.doi.org/10.1007/BFb0026293