A Excise Act, 1944. (3) If the Central Government, in respect of the dumped article under inquiry, is of the opinion that - (i) there is a history of dumping which caused injury or that the importer was, or should have been, aware that the exporter practices B dumping and that such dumping would cause injury; and (ii) the injury is caused by massive dumping of an article imported in a relatively short time which in the light of the timing and the volume of imported article dumped and other circumstances is likely to seriously undermine the remedial effect of the antic dumping duty liable to be levied, the Central Government may, by notification in the Official Gazette, levy anti-dumping duty retrospectively from a date prior to the date of imposition of antidumping duty under sub-section (2) but not beyond ninety days from the date of notification under that sub-section, and D notwithstanding anything contained in any other law for the time being in force, such duty shall be payable at such rate and from such date as may be specified in the notification. (4) The anti-dumping duty chargeable under this section shall be in addition to any other duty imposed under this Act or under any E other law for the time being in force. (5) The anti-dumping duty imposed under this section shall, unless revoked earlier, cease to have effect on the expiry of five years from the date of such imposition: Provided that if the Central Government, in a review, is of the F opinion that the cessation of such duty is likely to lead to continuation or recurrence of dumping and injury, it may, from time to time, extend the period of such imposition for a further period of five years and such further period shall commence from the date of order of such extension. G Provided further that where a review initiated before the expiry of the aforesaid period of five years has not come to a conclusion before such expiry, the anti-dumping duty may continue to remain in force pending the outcome of such a review for a further period not exceeding one year. H (6) The margin of dumping as referred to in sub- section (I) or