https://reptox.cnesst.gouv.qc.ca/pages/fiche-complete.aspx?no_produit=116251&nom=Hexachlorobutadiène-1,3 Canada toxicological data sheet hexachlorobutadiene
--- http://www.inrs.fr/accueil/produits/bdd/doc/fichetox.html?refINRS=FT%20121 France French butadienes butadienes butadienes butadienes butadienes occupational exposure occupational diseases reference values hexachlorobutadiene guidelines toxicological data sheet
--- https://www.hc-sc.gc.ca/ewh-semt/pubs/contaminants/psl2-lsp2/hexachlorobutadiene/index_f.html 2007 Canada scientific and technical information hexachlorobutadiene