Grzegorz Malewicz Matthew H. Austern Aart J. C. Bik James C. Dehnert Ilan Horn Naty Leiser Grzegorz Czajkowski Pregel: a system for large-scale graph processing. 6 2009 PODC http://doi.acm.org/10.1145/1582716.1582723 conf/podc/2009 db/conf/podc/podc2009.html#MalewiczABDHLC09