council decis april conclus agreement form exchang letter european commun republ iceland kingdom norwai swiss confeder relat amend convent common transit procedur ec council european union regard treati establish european commun articl conjunct articl sentenc thereof regard propos commiss articl convent european econom commun republ austria republ finland republ iceland kingdom norwai kingdom sweden swiss confeder common transit procedur empow joint committe set convent make recommend amend convent joint committe recommend amend convent permit recoveri charg mean mutual assist contract parti amend question set recommend joint committe approv agreement form exchang letter relat recommend decid articl agreement form exchang letter european commun republ iceland kingdom norwai swiss confeder relat amend convent common transit procedur approv behalf commun text agreement attach decis articl presid council author design person empow sign agreement order bind commun luxembourg april council presid juppé oj