参考文献
Adams, E. G.; Simmons, N. T.
Nature (London, United Kingdom), 1953 , vol. 172, p. 1104 - 1105
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Kainz, G.; Scheidl, F.
Mikrochim. Ichnoanal. Acta, 1964 , p. 539 - 546
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Gmelin Handbook: C: MVol.C2, 1.9.4, page 146 - 147