Passalus opacus (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Passalus opacus" in Russian language version.

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Gravely F.H. Contribution towards the Revision of the Passalidae of the World (англ.) // Memoirs of the Indian Museum. — 1918. — Vol. 7. — P. 1—144. — doi:10.5962/bhl.title.9238.

Jimenez-Ferbans L., Reyes-Castillo P., Schuster J.C. The Passalidae from Bolivia, with the descriptions of three new species (англ.) // ZooKeys. — 2019. — Vol. 882. — P. 51–85. — doi:10.3897/zookeys.882.35532.
Gravely F.H. Contribution towards the Revision of the Passalidae of the World (англ.) // Memoirs of the Indian Museum. — 1918. — Vol. 7. — P. 1—144. — doi:10.5962/bhl.title.9238.