- Julio Mariño, editor, Functional and Constraint Logic Programming - 19th International Workshop, WFLP 2010, Madrid, Spain, January 17, 2010. Revised Selected Papers. Volume 6559 of Lecture Notes in Computer Science, Springer, 2011.
- Herbert Kuchen, editor, Functional and Constraint Logic Programming - 20th International Workshop, WFLP 2011, Odense, Denmark, July 19th, Proceedings. Volume 6816 of Lecture Notes in Computer Science, Springer, 2011.