Michael DeRosa, Seth Copen Goldstein, Peter Lee, Jason Campbell, Padmanabhan Pillai. Scalable Shape Sculpting via Hole Motion: Motion Planning in Lattice-constrained Modular Robots. In Proceedings of the 2006 IEEE International Conference on Robotics and Automation, ICRA 2006, May 15-19, 2006, Orlando, Florida, USA. pages 1462-1468, IEEE, 2006.