Arne Andersson Torben Hagerup Johan Håstad Ola Petersson Tight Bounds for Searching a Sorted Array of Strings. 1552-1578 2000 30 SIAM J. Comput. 5 http://epubs.siam.org/sam-bin/dbq/article/32988 db/journals/siamcomp/siamcomp30.html#AnderssonHHP00