D. Lee, K. Crary, and R. Harper. POPL '07: Proceedings of the 34th annual ACM SIGPLAN-SIGACT symposium on Principles of programming languages, page 173-184. New York, NY, USA, ACM Press, (2007)
G. LEE, S. ARNOLD, J. EATON, H. SARKAS, K. BOWEN, C. LUDEWIGT, and H. HABERLAND. ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 20 (1-4):
9-12(1991)5TH INTERNATIONAL SYMP ON SMALL PARTICLES AND INORGANIC CLUSTERS,
KONSTANZ, FED REP GER, SEP 10-14, 1990.
S. Lawrence, K. Bollacker, and C. Giles. Proceedings of the Third International Conference on
Autonomous Agents, page 392--393. New York, NY, ACM Press, (May 1999)