Guex, J.; Hungerbühler, A.; O'Dogherty, L.; Atudorei, V.; Taylor, D. G.; Bucher, H.; Bartolini, A. (2010). Spathian (Lower Triassic) ammonoids from western USA (Idaho, California, Utah and Nevada). Mémoires de Géologie (Lausanne). 49: 1-82.
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Guex, J.; Hungerbühler, A.; O'Dogherty, L.; Atudorei, V.; Taylor, D. G.; Bucher, H.; Bartolini, A.
2010
Spathian (Lower Triassic) ammonoids from western USA (Idaho, California, Utah and Nevada)