@inbook{1c77e5ffb45745888929ed200550ff9a,
title = "Extent, duration, and nature of the Permian-Triassic superanoxic event",
author = "PB Wignall and RJ Twitchett",
note = "Other: 10.1130/0-8137-2356-6(2002)356<395:ANOTTS>2.0.CO;2",
year = "2002",
language = "English",
isbn = "0813723566",
volume = "Special Paper 356",
pages = "395 -- 413",
editor = "C Koeberl and KG MacLoed",
booktitle = "Catastrophic events and mass extinctions: impacts and beyond",
publisher = "Geological Society of America",
address = "United States",
}