26338 20190411160518.0 9780521634083 CH-GeUNH eng Byers, Michael Custom, power and the power of rules : international relations and customary international law / Michael Byers Cambridge, United Kingdom: Cambridge University Press, 1999 English INTERNATIONAL RELATIONS CUSTOMARY INTERNATIONAL LAW INTERNATIONAL LAW OHCHR DOC LIB/INTL/8/33 General Collection BOOK Books