An Architecture for Efficient Integration and Harmonization of Heterogeneous, Distributed Data Sources Enabling Big Data Analytics Topics: Coupling and Integrating Heterogeneous Data Sources; Distributed Database Systems; Interoperability; Knowledge Management; Methods, Processes and Patterns for EA Development In Proceedings of the 20th International Conference on Enterprise Information Systems - Volume 1: ICEIS, 175-182, 2018 , Funchal, Madeira, Portugal