The effectiveness of soft law: first insights from comparing legally binding agreements with flexible action programs Author Köppel M. Journal/Series Georgetown International Environmental Law Review | Vol.21(4); 821-835;14 p. Date 2009 Source IUCN (ID: ANA-082562) Publisher | Place of publication Georgetown University Law Center | 600 New Jersey Ave. NW, Washington, DC 20001, USA Document type Article in periodical Language English Field of application International Subject Water, Environment gen. Keyword Soft law Basin Rhine