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WikiPedia: Perm (geologi) http://www.ucmp.berkeley.edu/permian/permstrat.htm... http://www.ucmp.berkeley.edu/permian/glassmts.html http://www.geo-lieven.com/erdzeitalter/perm/perm.h... http://www.stratigraphy.org/gssp.htm http://www.stratigraphy.org/ https://www.dictionary.com/browse/Permian https://archive.org/details/ongeologicalstr00keysg... https://archive.org/details/geologyrussiaeu1murc/p... https://ui.adsabs.harvard.edu/abs/2010Geo....38.10... https://ui.adsabs.harvard.edu/abs/2017ESRv..170......