Perm (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Perm" in Polish language version.

Last modified: 11:47:00, 6 February 2026 (UTC)

Ref.Un. Ref.Website

Global rank Polish rank

2^nd place

5^th place

14^th place

174^th place

2,908^th place

2,662^nd place

254^th place

680^th place

adsabs.harvard.edu (Global: 14^th place; Polish: 174^th place)

B.U. Haq, S.R. Schutter. A Chronology of Paleozoic Sea-Level Changes. „Science”. 322 (5898), s. 64–68, 2008. DOI: 10.1126/science.1161648. Bibcode: 2008Sci...322...64H.

B.U. Haq, S.R. Schutter. A Chronology of Paleozoic Sea-Level Changes. „Science”. 322 (5898), s. 64–68, 2008. DOI: 10.1126/science.1161648. Bibcode: 2008Sci...322...64H.

International Stratigraphic Chart. International Comission on Stratigraphy, grudzień 2025. [dostęp 2026-02-06]. (ang.).

Alexandra Witze: Massive Volcanism May Have Caused Biggest Extinction Ever. Wired, 2010-12-14. [dostęp 2010-12-15]. (ang.).