@conference { 98,
	title = {Three-dimensional Directed Construction by Mobile Robots},
	booktitle = {Workshop on Self-Reconfigurable Modular Robots, Robotics: Science and Systems (RSS)},
	year = {2006},
	url = {files/ssr/files/rsswk06-werfel.pdf},
	author = {Werfel, Justin and Radhika Nagpal}
}
