kreidefossilien.de • Die sächsisch-böhmische Kreide

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• Sladen, W.P. & Spencer, W.K., 1908.

  Monograph on the British fossil Echinodermata from the cretaceous formations. II (1–5). The Asteroidea and Ophiurioidea – (Palaeontographical Society) London 44–62: 1–138. e-book : https://www.kreidefossilien.de/590

• Spencer, W.K., 1914.

  The Evolution of the Cretaceous Asteroidea – Philosophical transactions of the Royal Society of London, Series B. Containing Papers of a Biological Character (Harrison & Sons) London 204 (IV): 99–177. e-book : https://doi.org/10.1098/rstb.1914.0004

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