Capturing Gas Fluxes on Your Phone: An iOS‐and Android‐based Data‐Logging Setup for EGM‐4 Environmental Gas Monitoring Systems HP Sterk, I Detrey, C Marshall, NR Cowie, R Payne, J McIlvenny, ... Journal of environmental quality 48 (5), 1557-1560, 2019 | 1 | 2019 |