Plectronoceras (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Plectronoceras" in Bulgarian language version.

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doi.org

dx.doi.org

Webers, G. F. Late Cambrian molluscan faunas and the origin of the Cephalopoda // Origins and Evolution of the Antarctic Biota. Т. 47. Geological Society, London: Special Publications, 1989. DOI:10.1144/GSL.SP.1989.047.01.04. с. 29.

pan.pl

paleo.pan.pl

Dzik, J. Origin of the cephalopoda // Acta Palaeontologica Polonica 26 (2). 1981. с. 161 – 191.