Ptychagnostus (Ukrainian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ptychagnostus" in Ukrainian language version.

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Brian D. E. Chatterton, Desmond H. Collins & Rolf Ludvigsen (2003). Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences. У Philip D. Lane, Derek J. Siveter & Richard A. Fortey (ред.). Trilobites and their Relatives: contributions from the third international conference, Oxford 2001. Special Papers in Palaeontology. Т. 70. с. 157—173. ISBN 978-0-901702-81-4. Архів оригіналу за 21 березня 2022. Процитовано 28 травня 2019.

Brian D. E. Chatterton, Desmond H. Collins & Rolf Ludvigsen (2003). Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences. У Philip D. Lane, Derek J. Siveter & Richard A. Fortey (ред.). Trilobites and their Relatives: contributions from the third international conference, Oxford 2001. Special Papers in Palaeontology. Т. 70. с. 157—173. ISBN 978-0-901702-81-4. Архів оригіналу за 21 березня 2022. Процитовано 28 травня 2019.