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Systematics of the Ordovician Trilobites Ischyrotoma and Dimeropygiella, With Species from the Type Ibexian Area, Western USA. Journal of Paleontology 75, 947-971. doi:10.1666/0022-3360(2001)075<0947:SOTOTI>2.0.CO;2, 2001.
Classification of the Trilobite Subfamilies Hystricurinae and Hintzecurinae subfam. nov., with New Genera from the Lower Ordovician (Ibexian) of Idaho and Utah. Memoirs of the Queensland Museum 41, 55-105., 2003.
Trilobite Biostratigraphy of the Stairsian Stage (upper Tremadocian) of the Ibexian Series, Lower Ordovician, Western United States. Memoirs of the Associaiton of Australasian Palaeontologists 45, 167–214., 2014.