@article{RO_2008__42_4_455_0,
     author = {Rosa M. V. Figueiredo and Barbosa, Valmir C. and Maculan, Nelson and Cid C. de Souza},
     title = {Acyclic orientations with path constraints},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {455--467},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {4},
     year = {2008},
     doi = {10.1051/ro:2008028},
     mrnumber = {2469106},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ro:2008028/}
}