An overview of NASA's Laser Risk Reduction Program. - Anne Marie Novo-Gradac; William S. Heaps; Upendra N. Singh (IGARSS, 2004)

Differential radiometers using Fabry-Perot interferometric technique for remote sensing determination of various atmospheric trace gases. - Elena M. Georgieva; William S. Heaps; Emily L. Wilson (IGARSS, 2007)

Development of a Compact, Lightweight, Passive Fabry-Perot Radiometer for Measurements of Trace Gases in the Martian Atmosphere. - Elena M. Georgieva; William S. Heaps; Emily L. Wilson (IGARSS (4), 2008)

Differential Radiometers Using Fabry-Perot Interferometric Technique for Remote Sensing of Greenhouse Gases. - Elena M. Georgieva; William S. Heaps; Emily L. Wilson (IEEE Trans. Geosci. Remote. Sens., 2008)

One micron laser technology advancements at GSFC. - William S. Heaps (IGARSS, 2010)

Nasa's Laser Risk Reduction Program: A risk reduction approach for technology development. - Eduardo Torres-Martinez; William S. Heaps; Upendra N. Singh (IGARSS, 2010)

Robust IR Remote sensing technique of the total column of trace gases including carbon dioxide and methane. - Elena M. Georgieva; William S. Heaps (IGARSS, 2011)

A new remote sensing filter radiometer employing a Fabry-Perot etalon and a CCD camera for column measurements of methane in the Earth atmosphere. - Elena M. Georgieva; Wen Huang; William S. Heaps (IGARSS, 2012)