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MR651465 68C25 (05C20 68E10)
Blum, M.; Karp, R. M.; Vornberger, O.; Papadimitriou, C. H.; Yannakakis, M. The complexity of testing whether a graph is a superconcentrator. Inform. Process. Lett. 13 (1981), no. 4-5, 164–167.
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