@article{Barbosa1999, 
     author = "Barbosa, Valmir C. and Szwarcfiter, Jayme L.", 
     doi = "10.1016/S0020-0190(99)00120-9", 
     issn = "00200190", 
     journal = "Information Processing Letters", 
     keyword = "Acyclic orientations,Algorithms,Graphs", 
     link = "http://www.sciencedirect.com/science/article/pii/S0020019099001209 http://linkinghub.elsevier.com/retrieve/pii/S0020019099001209", 
     month = "oct", 
     number = "1-2", 
     pages = "71--74", 
     title = "Generating all the acyclic orientations of an undirected graph", 
     uri = "http://www.sciencedirect.com/science/article/pii/S0020019099001209", 
     volume = "72", 
     year = "1999", 
}

Problems: 304