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Regel 56:
* {{en}} {{Aut|Norton, P.E.P. & Spaink, G.}}, 1973. ''The earliest occurrence of Macoma balthica (L.) as a fossil in the North Sea deposits.'' Malacologia, 14: 33-37.
* {{en}} {{Aut|Spaink, G. & Norton, P.E.P.}}, 1967. ''The stratigraphical range of Macoma balthica (L.)(Bivalvia, Tellinacea) in the Pleistocene of The Netherlands and Eastern England.'' Mededelingen van de Geologische Stichting, (NS) 18: 39-44.
* {{en}} {{Aut|Vermeij, G.J.}}, 1991. ''Anatomy of an invasion: the trans-Arctic interchange.'' Paleobiology, 17: 281-307. [http://www.jstor.org/pss/2400870 Abstract]
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