M. Hellmuth, D. Merkle, M. Middendorf
Extended shapes for the combinatorial design of RNA sequences
International Journal of Computational Biology and Drug Design, 2(4): 371 - 384, 2009.

K. Diwold, D. Merkle, M. Middendorf
Adapting to Dynamic Environments: Polyethism in Response Threshold Models for Social Insects
Advances in Complex Systems, 12(3): 327-346, 2009.