by Richard M. Buxbaum and Klaus J. Hopt ; : us, : gw. -- De Gruyter, 1988. -- (European University Institute = Institut universitaire européen ; ser. A . Law = Droit = Recht = Diritto ; 2 . { Integration through law / series under the general editorship of Mauro Cappelletti, Monica Seccombe, Joseph Weiler } ; v. 4).