@article{Garey1978, 
     author = "Garey, Michael R. and Tarjan, Robert E.", 
     doi = "10.1016/0020-0190(78)90015-7", 
     issn = "00200190", 
     journal = "Information Processing Letters", 
     link = "http://www.sciencedirect.com/science/article/pii/0020019078900157", 
     number = "6", 
     pages = "274--276", 
     title = "A linear-time algorithm for finding all feedback vertices", 
     uri = "http://www.sciencedirect.com/science/article/pii/0020019078900157", 
     volume = "7", 
     year = "1978", 
}

Problems: 177