Matteo Detto, Joseph Verfaillie, Frank Anderson, Liukang Xu, Dennis Baldocchi, Comparing laser-based open- and closed-path gas analyzers to measure methane fluxes using the eddy covariance method, Agricultural and Forest Meteorology, Volume 151, Issue 10, 15 October 2011, Pages 1312-1324.
Sigrid Dengel, Peter E. Levy, John Grace, Stephanie K. Jones, and Ute M. Skiba (2011), Methane emissions from sheep pasture, measured with an open-path eddy covariance system. Global Change Biology, Volume 17, Issue 12, pg 3524-3533.