1. Cisco, Cisco Visual networking Index: Global Mobile Data Traffic Forecast Update, 2011-2016, White Paper, 2012. http://www.cisco.com/en/US/solutions/collateral/ns341/ns525/ns537/ns705/ns827/white_paper_c11-520862.pdf
2. Qualcomm, LTE Direct, 2011. http://www.qualcomm.com/about/research/projects/lte-direct
3. www.PCWorld.com , Emerging LTE Direct Standard Would Go Peer to Peer for 4G Mobile Location, 2012. http://www.pcworld.com/article/259680/emerging_lte_direct_standard_would_go_peer_to_peer_for_4g_mobile_location.html
4. T. Clausen, C. Dearlove, and J. Dean, RFC 6130: Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP), IETF, 2011. http://tools.ietf.org/html/rfc6130
5. EADS and Alcatel-Lucent, Interoperable Mission Critical Broadband/Narrowband Solution for Public Safety Communications. In creating the Shared Wireless Broadband Network, Strategic White Paper, 2011. http://www.cassidiancommunications.com/pdf/WhitePaper_AL_EADS.pdf