Atmospheric chemistry and physics 20(8), 4787-4807 (2020). doi:10.5194/acp-20-4787-2020 Atmospheric Chemistry and Physics Droste, E S, Adcock, K E, Ashfold, M J, Chou, C, Fleming, Z, Fraser, P J, Gooch, L J, Hind, A J, Langenfelds, R L, Elvidge, E L, Hanif, N M, O'Doherty, S, Oram, D E, Ou-Yang, C F, Panagi, M, Reeves, C E, Sturges, W T & Laube, J C 2020, ' Trends and emissions of six perfluorocarbons in the Northern Hemisphere and Southern Hemisphere ', Atmospheric Chemistry and Physics, vol. 20, no. 8, pp. 4787-4807 . https://doi.org/10.5194/acp-20-4787-2020 Atmospheric Chemistry and Physics, Vol 20, Pp 4787-4807 (2020)