41. A constitutional conventions, and public international law . 42. His main academic specializations are in public international law , human rights law, environmental law and international criminal law. 43. From 1978 to 1992, he served as a Professor of Public International Law at the University of Leiden. 44. International Commercial law became a branch of domestic law : private international law, separate from public international law . 45. Second, the legal regime which applies in these areas is determined by public international law regarding belligerent occupation ." 46. His career then took him to Oxford in 1972, where he was elected Chichele Professor of Public International Law . 47. The current director is Professor Stephen J . Toope, a noted expert on human rights, and public international law . 48. Professor at the Law Faculty of Dijon for 20 years ( Public International Law and Industrial Relations Law ). 49. Pieter Kooijmans, the Dutch foreign minister in 1993-1994, is a professor of public international law at the University of Leiden. 50. It has today become an important concept in public international law by which states refuse to extradite their own citizens.
