Added link to arXiv pre-print of DCDB paper in README

README.md

-# DCDB
+# The Data Center Data Base
 
-The *DataCenter* *DataBase* (DCDB) is a modular, continuous and holistic monitoring framework targeted at HPC environments. The framework consists of the three main parts:
+The *Data Center* *Data Base* (DCDB) is a modular, continuous and holistic monitoring framework targeted at HPC environments. The framework consists of the three main parts:
 
 * _Storage_ _Backend_: Here all the collected data is stored. By default a Cassandra database is used but the framework is intended to support usage of other data storage solutions as well.
 * _Collect_ _Agent_: The collect agent functions as intermediary between one storage backend and one or multiple pushers.
@@ -47,6 +47,10 @@ $ cd dcdb/dcdbpusher
 $ ./dcdbpusher config/
 ```
 
+## References
+
+* Alessio Netti, Micha Mueller, Axel Auweter, Carla Guillen, Michael Ott, Daniele Tafani and Martin Schulz. _From Facility to Application Sensor Data: Modular, Continuous and Holistic Monitoring with DCDB_. Proceedings of the International Conference for High Performance Computing, Networking, Storage, and Analysis (SC) 2019. [arXiv pre-print available here.](https://arxiv.org/abs/1906.07509) 
+
 ## License and Copyright
 
 Copyright (C) 2011-2019 Leibniz Supercomputing Centre