Nashat Mansour Ravi Ponnusamy Alok N. Choudhary Geoffrey Fox Graph Contraction for Physical Optimization Methods: A Quality-Cost Tradeoff for Mapping Data on Parallel Computers. 1-10 1993 International Conference on Supercomputing http://doi.acm.org/10.1145/165939.165942 db/conf/ics/ics1993.html#MansourPCF93