Atish Das Sarma Ashwin Lall Danupon Nanongkai Jun Xu Randomized Multi-pass Streaming Skyline Algorithms. 85-96 2009 2 PVLDB 1 http://www.vldb.org/pvldb/2/vldb09-385.pdf db/journals/pvldb/pvldb2.html#SarmaLNX09