On the difficulty of some shortest path problems
John E. Hershberger,
Subhash Suri,
and Amit M. Bhosle
Proc. 20th Symp. Theoretical Aspects of Computer Science (STACS 2003), Lecture Notes in Computer Science 2607, Helmut Alt
and Michel Habib, ed., Springer-Verlag, 2003, pp. 343–354
http://www.cs.ucsb.edu/~bhosle/publications/stacs03.pdf
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