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2. S. V. Stearns, R. Y. Lines, C. J. Grund, and R. Philbrick, "Technology Status Report on Active Remote Detection of Natural Gas Pipeline Leaks," Prepared for the U.S. Department of Energy National Energy Technology Lab (2004), http://www.netl.doe.gov/scngo/Natural%20Gas/projects/transmission/ngi/td/pubs/DOENETL%20 Technology%20Status%20ReportFINAL.pdf.
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5. S. V. Stearns, "ITT industries airborne natural gas emission lidar (ANGEL) service," presented at Natural Gas Technologies 2005 Conference, Orlando, 31 January 2005, Orlando FL., Gas Technology Institute.