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5. CONCAWE 1994 The use of dimethylsulphoxide (DMSO) extract by the IP346 method as an indicator of the carcinogenicity of lubricant base oils and distillate aromatic extracts. CONCAWE report No 94/51 https://www.concawe.eu/wp-content/uploads/2017/01/rpt9451ocr-2005-00417-01-e.pdf