Anti-dumping duty may be imposed on imports sold below normal value up to the margin of dumping, with provisional and remedial measures. Anti-dumping duty may be imposed on imported articles sold at less than their normal value, not exceeding the margin of dumping, after inquiry and as prescribed by rules. Export price and normal value are defined by reference to export transactions, domestic comparable prices, third-country prices, or cost of production plus additions. Provisional duties may be imposed pending final determination with refunds for excess; retrospective levies, circumvention extensions, absorption countermeasures, and time-limited reviews and extensions are provided. Procedural and enforcement matters follow the Customs Act and rules.