1. Paleontology of Late Proterozoic and Early Cambrian rocks of east-central Alaska;Allison;US Geological Survey Professional Paper,1988
2. Brakhiopody kuraganskoy svity ordovika Yuzhnogo Urala;Andreeva;Paleontologicheskiy Zhurnal,1972
3. New species of Archaeocyathinae and other organisms from the Lower Cambrian of Beltana, South Australia;Bedford;Memoirs of the Kyancutta Museum,1934
4. Taxonomy of disarticulated fossils;Bengtson;Journal of Paleontology,1985