What Are the Most Influential English Language Journal Articles or Papers in Private International Law?

As part of an ongoing research project, I am in the midst of compiling the most influential Engligh language papers in the field of private international law.  Given the expertise of our readership, I wanted to solicit your thoughts on this question.  Please feel free to post responses in the comments or via email to me.  I will happily share the compiled results in a future post.  Many thanks!