@Journal{DBLP:journals/algorithmica/AbelloBW02,
   title = {A Functional Approach to External Graph Algorithms},
   author = {James Abello and Adam L. Buchsbaum and Jeffery Westbrook},
   year = 2002,
   Journal = {Algorithmica},
   Volume = 32,
   Number = 3,
   Pages = {437-458}
}