Rosa M. V. Figueiredo Valmir Carneiro Barbosa Nelson Maculan Cid C. de Souza Acyclic Orientations with Path Constraints. 455-467 2008 42 RAIRO Oper. Res. 4 https://doi.org/10.1051/ro:2008028 db/journals/rairo/rairo42.html#FigueiredoBMS08