Couchbase: Understanding group_level in View Queries with Couchbase Server 2.0 by Roberto Zicari · Published January 1, 2013 · Updated February 16, 2014 LINK
The Forrester Wave™: NoSQL Document Databases, Q3 2014 October 6, 2014 by Roberto Zicari · Published October 6, 2014
NoSQL Failover Characteristics: Aerospike, Cassandra, Couchbase, and MongoDB March 1, 2013 by Roberto Zicari · Published March 1, 2013 · Last modified June 6, 2014
Gartner Magic Quadrant for Operational DBMS 2015 October 16, 2015 by Roberto Zicari · Published October 16, 2015