TRAINS, An Active Time-Table Searcher. - Eduard Tulp; Laurent Siklóssy (ECAI, 1988)

Searching time-table networks. - Eduard Tulp; Laurent Siklóssy (Artif. Intell. Eng. Des. Anal. Manuf., 1991)

The Space Reduction Method: A Method to Reduce the Size of Search Spaces. - Laurent Siklóssy; Eduard Tulp (Inf. Process. Lett., 1991)