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WikiPedia: Siết_cổ http://www.emedicine.com/emerg/topic227.htm http://judounleashed.com https://catalogue.bnf.fr/ark:/12148/cb12491952z https://data.bnf.fr/ark:/12148/cb12491952z https://id.loc.gov/authorities/subjects/sh85128502 https://d-nb.info/gnd/4183566-9 https://www.wikidata.org/wiki/Q1145328#identifiers