1. Aarts, E.H.L., Lenstra, J.K., “Introduction”, in Aarts E., Lenstra J.K. (eds.), “Local Search in Combinatorial Optimization”, John Wiley & Sons, United Kingdom (1997), pp. 1–17.
2. Bennett, M., Radburn, M., “Information Technology in Tourism: The Impact on the Industry and Supply of Holidays”, in Sinclair, M.T., Stabler, M.J. (eds.), “The Tourism Industry, An International Analysis”, C.A.B. International, United Kingdom (1991), pp. 45–65.
3. Crouch, G.I., “Expert Computer Systems In Tourism: Emerging Possibilities”, Journal of Travel Research, vol. 29, no. 3 (winter 1991), pp. 3–10.
4. Halatsis, C., Stamatopoulos, P., Karali, I, Mourlas, C., Gouscos, D., Margaritis, D., Fouskakis, C., Kolokouris, A., Xinos, P., Reeve, M., Véron, A., Schuerman, K., Li, L.L., “MaTourA: Multi-Agent Tourist Advisor”, in “International Conference on Information and Communication Technologies in Tourism, Innsbrück, 1994” proceedings, Springer-Verlag, Austria (1994), pp. 140–147.
5. Hruschka, H., Mazanec, J., “Computer-Assisted Travel Counseling”, Annals of Tourism Research, vol. 17, no. 2 (1990), pp. 208–227.