Joachim Gudmundsson Jan Vahrenhold A Simple Algorithm for I/O-efficiently Pruning Dense Spanners. 2004 Cache-Oblivious and Cache-Aware Algorithms http://drops.dagstuhl.de/opus/volltexte/2005/156 conf/dagstuhl/2004P4301 db/conf/dagstuhl/P4301.html#GudmundssonV04