1. http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=211
2. Radar RA. BIOPHARMA: biopharmaceutical products in the U.S. and European markets (Online) http://www.biopharma.com/approvals_2011.html
3. National Aeronautics and Space Administration web information http://www.nasa.gov/mission_pages/station/research/experiments/Environmental_Monitoring.html#overview