(Mikio Braun): http:// blog.mikiobraun.de/2014/05/bbuzz- realtime-personalization- recommendation-stream-mining.html ‣Algorithms and data structures that power Lucene and Solr (Adrien Grand): http:// berlinbuzzwords.de/session/ algorithms-and-data-structures- power-lucene-and-elasticsearch ‣HypeLogLog in Reds: http:// redis.io/commands#hyperloglog ‣Sketching & Scaling Series: http://blog.kiip.me/engineering/ sketching-scaling-part-1-what- the-is-sketching/