title = {On the difficulty of some shortest path problems},
author = {John E. Hershberger and Subhash Suri and Amit M. Bhosle},
booktitle = {Proc. 20th Symp. Theoretical Aspects of Computer Science (STACS 2003)},
number = {2607},
editor = {Helmut Alt and Michel Habib},
series = {Lecture Notes in Computer Science},
publisher = {Springer-Verlag},
pages = {343--354},
year = {2003},
url = {http://www.cs.ucsb.edu/~bhosle/publications/stacs03.pdf}}

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