1. Beyond the Hart/Dworkin Debate: the Methodology Problem in Jurisprudence;Leiter, Brian. Naturalizing Jurisprudence,2007
2. Incorporationism, Conventionality, and the Practical Difference Thesis;Jules L Coleman;Hart endorses inclusive positivism in his Postscript. See also,2001
3. Micklitz argues EU is a "non-systematic" normative system and goes further with the proposition that it is also an unsystematic system of rules. For him, any attempt at systematization would harm the multi-legal cultural existing in Europe. See Micklitz, Hans-W;-W Hans;Towards a European Legal Culture,2014
4. two key transactions in energy: Supply Contracts and Transmission Service. The first type of transaction refers to a type of bilateral sales contract, in which goods (and services) are electricity or natural gas and parties sell and purchase it for spot, short;Thomas ; Wilhelmsson;Private Law and the Many Cultures of Europe,2006