@inproceedings{ccl-fsntc-10
, author =        "Cabello, Sergio and Colin~de Verdi{\`e}re, {\'E}ric and
                   Lazarus, Francis"
, title =         "Finding shortest non-trivial cycles in directed
                   graphs on surfaces"
, booktitle =     "Proceedings of the 26th Annual ACM Symposium on
                   Computational Geometry (SOCG)"
, year =          "2010"
, pages =         "156--165"
}