6See Albrecht Randelzhofer, "Article 51", in Bruno Simma, ed., The Charter of the United Nations: A Commentary, Oxford: Oxford University Press, 1995, pp. 675 - 676.
7Brun - Otto Bryde, "Self - Defence", in Rudolf Bemhardt, ed., Encyclopedia of Public International Law,Amsterdam:North- Holland Publishing Company, vol. 4, 1982, p. 214.