Richard Beigel
and David Eppstein
Tech. report TR95-033, Electronic Colloq. on Computational Complexity, 1995
Proc. 36th Symp. Foundations of Computer Science, IEEE, Oct 1995, pp. 444–453
ftp://ftp.eccc.uni-trier.de/pub/eccc/reports/1995/TR95-033/index.html
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