@inproceedings{Birmele2012, 
     address = "Cartagena de Indias, Colombia", 
     author = "Birmel\'{e}, E and Crescenzi, Pierluigi and Ferreira, Rui", 
     booktitle = "SPIRE 2012: the 19th International Symposium String Processing and Information Retrieval", 
     doi = "10.1007/978-3-642-34109-0_13", 
     editor = "Calder\'{o}n-Benavides, Liliana and Gonz\'{a}lez-Caro, Cristina and Ch\'{a}vez, Edgar and Ziviani, Nivio", 
     link = "http://link.springer.com/chapter/10.1007/978-3-642-34109-0_13", 
     month = "oct", 
     pages = "118--129", 
     publisher = "Springer Berlin Heidelberg", 
     series = "Lecture Notes in Computer Science", 
     title = "Efficient bubble enumeration in directed graphs", 
     uri = "http://link.springer.com/chapter/10.1007/978-3-642-34109-0_13", 
     volume = "7608", 
     year = "2012", 
}

Problems: 9