1. Minimum illumination intensities in foot-candles. https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10630. Minimum illumination intensities in foot-candles. https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10630.
2. Ieee 802.11g standard 2003. http://standards.ieee.org/getieee802/download/802.11g-2003.pdf Ieee 802.11g standard 2003. http://standards.ieee.org/getieee802/download/802.11g-2003.pdf
3. Ieee 802.21 standard 2008. http://standards.ieee.org/getieee802/download/802.21-2008.pdf. Ieee 802.21 standard 2008. http://standards.ieee.org/getieee802/download/802.21-2008.pdf.
4. M. Buettner. Backscatter Protocols and Energy-Efficient Computing for RF-Powered Devices. PhD thesis 2013. M. Buettner. Backscatter Protocols and Energy-Efficient Computing for RF-Powered Devices. PhD thesis 2013.