Bibtex of Graph / Orientation

@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", 
}

@article{Conte2018, 
     author = "Conte, Alessio and Grossi, Roberto and Marino, Andrea and Rizzi, Romeo", 
     doi = "10.1016/j.dam.2017.08.002", 
     issn = "0166218X", 
     journal = "Discrete Applied Mathematics", 
     pages = "22--37", 
     publisher = "Elsevier B.V.", 
     title = "{Efficient enumeration of graph orientations with sources}", 
     volume = "246", 
     year = "2018", 
}

@article{Setiawan2011, 
     author = "Setiawan, Andry and Nakano, Shin-ichi", 
     doi = "10.1587/transfun.E94.A.1965", 
     issn = "09168508", 
     journal = "IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences", 
     keyword = "Enumeration,Graph,St-orientation", 
     link = "https://www.jstage.jst.go.jp/article/transfun/E94.A/10/E94.A_10_1965/_article", 
     number = "10", 
     pages = "1965--1970", 
     title = "Listing all st-orientations", 
     uri = "https://www.jstage.jst.go.jp/article/transfun/E94.A/10/E94.A_10_1965/_article", 
     volume = "E94-A", 
     year = "2011", 
}