The strange apical system of the genus Pourtalesia (Holasteroida, Echinoidea)
Saucede, T.; David, B. (2003). The strange apical system of the genus Pourtalesia (Holasteroida, Echinoidea), in: Féral, J.-P. et al. Echinoderm Research 2001: Proceedings of the 6th European Conference on Echinoderm Research, Banyuls-sur-mer, 3-7 September 2001. pp. 131-136
In: Féral, J.-P.; David, B. (2003). Echinoderm Research 2001: Proceedings of the 6th European Conference on Echinoderm Research, Banyuls-sur-mer, 3-7 September 2001. Swets and Zeitlinger: Lisse. ISBN 90-5809-528-2. XVI, 337 pp., meer
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