1. Stable isotope and high precision concentration measurements confirm that all humans produce and exhale methane. (29th January 2016) Authors: Keppler, Frank; Schiller, Amanda; Ehehalt, Robert; Greule, Markus; Hartmann, Jan; Polag, Daniela Journal: Journal of breath research Issue: Volume 10:Number 1(2016:Mar.) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗