supplementari protocol addit agreement valid princip liechtenstein agreement european econom commun swiss confeder european econom commun swiss confeder princip liechtenstein agre make amend addit agreement juli articl delet quot utferdiget brussel tjueandr juli nitten hundr og syttito quot quot rådet de europeisk fellesskap quot articl supplementari protocol drawn duplic danish dutch english french german italian languag text equal authent