1. The functional anatomy of trilobites: musculature and eyes;Campbell;Journal and Proceedings of the Royal Society of New South Wales,1975
2. Schizochroal eyes and vision of some Silurian acastid trilobites;Clarkson;Palaeontology,1966
3. Schizochroal eyes and vision of some phacopid trilobites;Clarkson;Palaeontology,1966
4. Fine structure of the eye in two species of Phacops (Trilobita);Clarkson;Palaeontology,1967
5. Structure of the eye of Crozonaspis struvei (Trilobita, Dalmanitidae Zeliszkellinae;Clarkson;Senckenbergiana Lethaea,1968