Nazario Cipriani Mike Eissele Andreas Brodt Matthias Großmann Bernhard Mitschang NexusDS: a flexible and extensible middleware for distributed stream processing. 152-161 2009 IDEAS http://doi.acm.org/10.1145/1620432.1620448 conf/ideas/2009 db/conf/ideas/ideas2009.html#CiprianiEBGM09