Your search returned the following 3 documents:

3. Approximating Covering Problems by Randomized Search Heuristics Using Multi-Objective Models
   Tobias Friedrich, Jun He, Nils Hebbinghaus, Frank Neumann, and Carsten Witt
   In: Genetic and Evolutionary Computation Conference 2007, London, UK, 2007, 797-804
   
2. Do Additional Objectives Make a Problem Harder?
   Dimo Brockhoff, Tobias Friedrich, Nils Hebbinghaus, Christian Klein, Frank Neumann, and Eckart Zitzler
   In: Genetic and Evolutionary Computation Conference 2007, London, UK, 2007, 765-772
   
1. Rigorous Analyses of Simple Diversity Mechanisms
   Tobias Friedrich, Nils Hebbinghaus, and Frank Neumann
   In: Genetic and Evolutionary Computation Conference 2007, London, UK, 2007, 1219-1225. Note: nominated for best paper award