1. , , and , On the parameterized complexity of short computation and factorization. To appear in the Archive for Mathematical Logic.
2. and , Fixed-parameter intractability (extended abstract). In: Proceedings of the 7th IEEE Conference on Structure in Complexity Theory, Boston June 1992, pp. 36–49.
3. and , Parameterized computational feasibility. In: Feasible Mathematics II ( and , eds.), Birkhäuser, Boston 1994.
4. Fixed-Parameter Tractability and Completeness I: Basic Results