Abreu, S., & Seipel, D. (2011). Applications of declarative programming and knowledge management: 18th International Conference, INAP 2009, Évora, Portugal, November 3-5, 2009, Revised Selected Papers. Springer Berlin Heidelberg.

Abreu, Salvador, and Dietmar Seipel. Applications of Declarative Programming and Knowledge Management: 18th International Conference, INAP 2009, Évora, Portugal, November 3-5, 2009, Revised Selected Papers. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011.

Abreu, Salvador, and Dietmar Seipel. Applications of Declarative Programming and Knowledge Management: 18th International Conference, INAP 2009, Évora, Portugal, November 3-5, 2009, Revised Selected Papers. Springer Berlin Heidelberg, 2011.