@article{Loizou1982, 
     author = "Loizou, G. and Thanisch, P.", 
     doi = "10.1016/0020-0255(82)90023-8", 
     issn = "00200255", 
     journal = "Information Sciences", 
     link = "http://linkinghub.elsevier.com/retrieve/pii/0020025582900238", 
     month = "aug", 
     number = "3", 
     pages = "163--182", 
     title = "Enumerating the cycles of a digraph: A new preprocessing strategy", 
     uri = "http://linkinghub.elsevier.com/retrieve/pii/0020025582900238", 
     volume = "27", 
     year = "1982", 
}

Problems: 444