- EPA Final Report OAUGDP Plasma Sterilization
http://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.highlight/abstract/1603

- Risk of Sick Leave Associated with Outdoor Air Supply Rate, Humidification and Occupant Complaints", Indoor Air, 5/31/00.
http://www.ncbi.nlm.nih.gov/pubmed/11089326

- Research and Development Program - EPA  Green Chemistry: A 21st Century Approach to Cleaner Chemicals.
http://www.epa.gov/gcc/pubs/grants.html 

- Indoor Environment Department, Environmental Energy Technologies Division, E.O. Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
http://www.ncbi.nlm.nih.gov/pubmed?term=19164188

- IEEE Transactions on Plasma Science - Feb. 2000, vol. 28 - "A Remote Exposure Reactor (RER) for Plasma Processing and Sterilization by Plasma Active Species at One Atmosphere"
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=842864

- NASA White Paper - "NASA's Potential Contributions for Using Solar Ultraviolet Radiation in Conjunction with Photocatalysis for Urban Air Pollution Mitigation."  April 2007.  Robert E. Ryan and Lauren W. Underwood.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070031034_2007030984.pdf