Discussions regarding the problem of identifying customary international law have essentially focused on two principal issues.
Hammer, Leonard M.
"Reconsidering The Israeli Courts' Application Of Customary International Law In The Human Rights Context,"
ILSA Journal of International & Comparative Law: Vol. 5
, Article 2.
Available at: http://nsuworks.nova.edu/ilsajournal/vol5/iss1/2