Christopher L. Barrett Keith R. Bisset Martin Holzer Goran Konjevod Madhav V. Marathe Dorothea Wagner Engineering Label-Constrained Shortest-Path Algorithms. 27-37 2008 AAIM http://dx.doi.org/10.1007/978-3-540-68880-8_5 conf/aaim/2008 db/conf/aaim/aaim2008.html#BarrettBHKVMW08