1. Wireless underground sensor networks: Research challenges
2. Wireless sensor networks: a survey
3. Aniss, H., Tardiff, P. M., Ouedraogo, R., & Fortier, P. (2004). Communications network for underground mines based on 802.11 and DOCSIS standards. In Proceedings of IEEE 60th Vehicular technology conference. Los Angeles, CA: IEEE.
4. ANSI. IEC 60529-2004. (2004). Degrees of protection provided by enclosures (IP Code). Retrieved from https://www.nema.org/Standards/ComplimentaryDocuments/ANSI-IEC-60529.pdf
5. BS6656. (2002). Assessment of inadvertent ignition of flammable atmosphere by radio frequency radiation-guide. Retrieved from http://www.hse.gov.uk/foi/internalops/og/og-00045.htm