D. Merkle, M. Middendorf
Dynamic Polyethism and Competition for Tasks in Threshold Reinforcement Models of Social Insects
Adaptive Behavior, 12: 251-262, 2004.
Preliminary version

M. Middendorf, D. Manlove
Combined Super-Substring and Super-/Subsequence problems
Theoretical Computer Science, 320(2-3): 247-267, 2004.

B. Scheuermann, K. So, M. Guntsch, M. Middendorf, O. Diessel, H. ElGindy, H. Schmeck
FPGA Implementation of Population-based Ant Colony Optimization
Applied Soft Computing 4(3): 303-322, 2004 (special issue on Hardware Implementations of Softcomputing Techniques)