++++ 1 . ACTION FOR ANNULMENT - NATURAL OR LEGAL PERSONS - MEASURES OF DIRECT AND INDIVIDUAL CONCERN TO THEM - REGULATION IMPOSING ANTI-DUMPING DUTIES - PRODUCERS AND EXPORTERS FROM NON-MEMBER COUNTRIES ( EEC TREATY, ART . 173, SECOND PARAGRAPH; COUNCIL REGULATION NO 3017/79 ) 2 . COMMON COMMERCIAL POLICY - PROTECTION AGAINST DUMPING - DUMPING MARGIN - DETERMINATION OF THE NORMAL VALUE AND THE EXPORT PRICE - CHOICE OF METHOD OF CALCULATION - DISCRETION OF THE COMMISSION - REVIEW BY THE COURT - LIMITS ( COUNCIL REGULATION NO 3017/79, ART . 2 ) 3 . COMMON COMMERCIAL POLICY - PROTECTION AGAINST DUMPING - COURSE OF THE INVESTIGATION - PRICE INCREASES MADE VOLUNTARILY BUT AFTER THE END OF THE PERIOD COVERED BY THE INVESTIGATION - NO INFLUENCE ON THE FIXING OF DEFINITIVE ANTI-DUMPING DUTIES - GROUND FOR REVIEW OR FOR REFUND OF THE DUTY COLLECTED ( COUNCIL REGULATION NO 3017/79, ARTS 2, 13, 14 AND 15 ) 4 . COMMON COMMERCIAL POLICY - PROTECTION AGAINST DUMPING - OFFER OF PRICE UNDERTAKINGS - ACCEPTANCE - DISCRETION OF THE INSTITUTIONS ( EEC TREATY, ART . 190; COUNCIL REGULATION NO 3017/79, ART . 10 )