1. Almeida-Dias, J.: Multiple criteria decision aiding for sorting problems: Concepts, methodologies, and applications. PhD dissertation, Univ. Téchnica de Lisboa and Univ. Paris Dauphine, Lisbon and Paris. (2011)
2. Antona, M., Ntoa, S., Adami, I., Stephanidis, C.: User Requirements Elicitation for Universal Access. In: Stephanidis, C. (ed.) The Universal Access Handbook, pp. 1–14. CRC Press (2009)
3. Brusilovsky, P., Karagiannidis, C., Sampson, D.: Layered evaluation of adaptive learning systems. Int. J. Contin. Eng. Edu. Lifelong Learn., Special Issue on Hybrid recommender 14(4–5), 402–421 (2004)
4. Brusilovsky, P., Karagiannidis, C., Sampson, D.: The benefits of layered evaluation of adaptive applications and services. In: 1st Workshop on Empirical Evaluation of Adaptive Systems at UM2001, pp. 1–8. Sonthofen, Germany (2001)
5. Carmagnola, F., Cena, F., Console, L., Cortassa, O., Gena, C., Goy, A., Torre, I., Toso, A., Vernero, F.: Tag based user modeling for social multi-device adaptive guides. User Model. User-Adap. Inter. 18(5), 497–538 (2008)