Djamal Belazzougui Paolo Boldi Rasmus Pagh Sebastiano Vigna Theory and Practise of Monotone Minimal Perfect Hashing. 132-144 2009 ALENEX http://www.siam.org/proceedings/alenex/2009/alx09_013_belazzouguid.pdf conf/alenex/2009 db/conf/alenex/alenex2009.html#BelazzouguiBPV09