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3. Ontogenetic studies of Middle Ordovician trilobites from the Esbataottine Formation, Mackenzie Mountains, Canada;Chatterton;Palaeontographica Abteilung A,1980
4. Ontogeny;Chatterton,1997
5. Ontogeny and relationships of Trinucleoidea (Trilobita);Chatterton;Journal of Paleontology,1994