@article{7bbe0e93928c4723b8cfc61be24bb97a,
title = "Non-hydrocarbon components of Carboniferous-sourced gas in the southern Permian basin, northwest Europe",
keywords = "natural gas, gas analysis, nitrogen, carbon dioxide, southern permian basin, zechstein, reservoirs, rocks, Earth systems and environmental sciences",
author = "R Gras and CJ Clayton",
year = "1998",
month = may,
doi = "10.1144/{\^O}{\c C}{\"i}petgeo.4.2.147",
language = "English",
volume = "4",
pages = "147--156",
journal = "Petroleum Geoscience",
issn = "1354-0793",
publisher = "Geological Society of London",
number = "2",
}