Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Kohring, R., and T. Schlüter. 1989. Historische und paläntologische Bestandsaufnahme des Simetits, eines fossilen Harzes mutmasslich mio/pliozänen Alters aue Sizilien . Documenta naturae 56:33-58.
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