![](https://www.pdfsearch.io/img/f83d501747a1eb7ea100b3cefeee54f9.jpg) Date: 2013-10-14 12:19:25
| | Published in J. ALGORITHMS 5, The NP-Completeness Column: An Ongoing Guide DAVID S. JOHNSON AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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