1 . ACCESSION OF NEW MEMBER STATES TO THE COMMUNITIES - ACT OF ACCESSION CONCERNING GREECE - APPLICATION OF COMMUNITY LAW AB INITIO AND IN TOTO - DEROGATIONS - WHETHER PERMISSIBLE - CONDITIONS ( ACT OF ACCESSION , ARTS . 2 AND 9 ( 1 )) 2 . ECSC - PRODUCTION - PRODUCTION QUOTA SYSTEM FOR CERTAIN PRODUCTS - DETERMINATION ON EQUITABLE BASIS - ADJUSTMENT OF GREEK UNDERTAKINGS ' REFERENCE PRODUCTION - POSSIBLE IN CASE OF EXCEPTIONAL DIFFICULTIES - CHALLENGING THE APPLICATION OF THE QUOTA SYSTEM TO THOSE UNDERTAKINGS IN THE PREVIOUS PERIOD - NOT PERMISSIBLE ( COMMISSION DECISION 1831/81/ECSC , ART 14A ) 3 . ACCESSION OF NEW MEMBER STATES TO THE COMMUNITIES - ACT OF ACCESSION CONCERNING GREECE - APPLICATION OF COMMUNITY LAW IN TOTO TO GREEK UNDERTAKINGS - EQUAL TREATMENT OF COMMUNITY UNDERTAKINGS - DEROGATIONS IN FAVOUR OF GREEK UNDERTAKINGS - EXCLUDED 4 . ECSC - PRODUCTION - PRODUCTION QUOTA SYSTEM FOR CERTAIN PRODUCTS - PURPOSE - RESTRICTIONS ON PRODUCTION - INFRINGEMENT OF THE RIGHT TO PROPERTY OF THE UNDERTAKINGS TO WHICH THEY APPLY - NONE ( COMMISSION DECISION 1831/81/ECSC ) 5 . ECSC - PRODUCTION - PRODUCTION QUOTA SYSTEM FOR CERTAIN PRODUCTS - PURPOSE - TAKING INTO ACCOUNT OF GREEK UNDERTAKINGS ' REFERENCE PRODUCTION PRIOR TO ACCESSION - INEQUALITY OF TREATMENT TO THE DETRIMENT OF THOSE UNDERTAKINGS - NONE ( COMMISSION DECISIONS 2794/80/ECSC AND 1831/81/ECSC )