@Article{fr-4-83-2001,
AUTHOR = {Aboussalam, Z. S. and Becker, R. T.},
TITLE = {Prospects for an upper Givetian substage},
JOURNAL = {Fossil Record},
VOLUME = {4},
YEAR = {2001},
NUMBER = {1},
PAGES = {83--99},
URL = {https://fr.copernicus.org/articles/4/83/2001/},
DOI = {10.1002/mmng.20010040107}
}