1. The economics of the thousand times challenge: Spectrum, efficiency and small cells. http://techneconomyblog.com/2012/11/02/the-economics-of-the-thousand-times-challenge (2012).
2. How interworking works: A detailed look at 802.11u and Hotspot 2.0 mechanisms. Tech. rep., Ruckus Wireless (2013).
3. Small cell market status. Tech. Rep. SCF050, Small Cell Forum (2013).
4. Small cells - big ideas. Tech. Rep. SCF030, Small Cell Forum (2014).
5. Björnson, E., Kountouris, M. & Debbah, M. (2013). Massive MIMO and small cells: Improving energy efficiency by optimal soft-cell coordination. CoRR abs/1304.0553.