Hybrid clouds for data-intensive, 5G-enabled IoT applications: An overview, key issues and relevant architecture - Trakadas, Panagiotis; Nomikos, Nikolaos; Emmanouel T. Michailidis; Zahariadis, Theodore; Federico M. Facca; David Breitgand; Stamatia Rizou; Xavi Masip; Gkonis, Panagiotis (Sensors, 2019)