commiss decis decemb conclus agreement european atom energi commun euratom canada cooper area nuclear research notifi document number euratom commiss european commun regard treati establish european atom energi commun paragraph articl thereof regard approv council agreement european atom energi commun euratom canada cooper area nuclear research approv decid articl agreement european atom energi commun euratom canada coopert area nuclear research approv behalf european atom energi commun text agreement attach decis articl presid commiss give commun notif provid articl agreement articl decis enter forc dai public offici journal european commun brussel decemb commiss leon brittan vice presid page offici journal