Your search returned the following 2 documents:

2. Rigorous Analyses for the Combination of Ant Colony Optimization and Local Search
   Frank Neumann, Dirk Sudholt, and Carsten Witt
   In: International Conference on Ant Colony Optimization and Swarm Intelligence 2008, Brussels, Belgium, 2008, 132-143
   
1. Theoretical Properties of Two ACO Approaches for the Traveling Salesman Problem
   Timo Kötzing, Frank Neumann, Heiko Röglin, and Carsten Witt
   In: Swarm Intelligence : 7th International Conference, ANTS 2010, Brussels, Belgium, 2010, 324-335