Download or read book International Investment Treaties and the Formation, Application and Transformation of Customary International Law Rules written by Cai Congyan and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: International custom is one of the main sources of international law. As a relatively new branch of international law, international investment treaties, emerging in the late 1950s and having been very energetic since the mid-1990s, have become a driving force and an important forum for the formation, application and transformation of the customary international law rules.