Knudsen J. (1997). Observation on Calyptraea extinctorium Lamrck, 1822 (Prosobranchia: Calyptraeidae) from Hong Kong. In: Morton B, editor. Proceedings of the Eighth International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China. The Marine Flora and Fauna of Hong Kong and Southern China IV. Hong Kong University Press, Hong Kong. pp 371-379.
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Knudsen, J.
1997
Observation on Calyptraea extinctorium Lamrck, 1822 (Prosobranchia: Calyptraeidae) from Hong Kong
Proceedings of the Eighth International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China. The Marine Flora and Fauna of Hong Kong and Southern China IV