1 . SOCIAL SECURITY FOR MIGRANT WORKERS - SOCIAL SECURITY BENEFITS - RIGHTS CREATED BY THE TREATY - EXERCISE - DETAILED RULES - POWER OF THE COUNCIL ( EEC TREATY , ARTICLE 51 ) 2 . SOCIAL SECURITY FOR MIGRANT WORKERS - SOCIAL SECURITY BENEFITS - OVERLAPPING - LIMITATION - ENTITLEMENT BY VIRTUE OF NATIONAL LEGISLATION ALONE - REDUCTION - PROHIBITION ( EEC TREATY , ARTICLE 51 ; REGULATION NO 1408/71 , ARTICLE 46 ( 3 ); DECISION NO 91 OF THE ADMINISTRATIVE COMMISSION )