Scheucher, Bernhard. "The Permic Languages". LanguageServer - the Languages of the World. The University of Graz. Archived from the original on March 4, 2016. Retrieved August 22, 2012.
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Scheucher, Bernhard. "The Permic Languages". LanguageServer - the Languages of the World. The University of Graz. Archived from the original on March 4, 2016. Retrieved August 22, 2012.