| 11. | He is cited in Creswell's Who's who in Public International Law.
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| 12. | Hagerup was passionately involved in the development of public international law.
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| 13. | Intergovernmental organization " Intergovernmental organizations are an important aspect of public international law.
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| 14. | This is considered his principal work and a classic of public international law.
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| 15. | Prior to this appointment, he was a Professor of Public International Law in Kinshasa.
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| 16. | He specialized in constitutional law, administrative law, philosophy of law and public international law.
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| 17. | Intergovernmental organizations are an important aspect of public international law.
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| 18. | Sometimes, also norms of another system may interfere, for instance of public international law.
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| 19. | Finally in 1961, he received PhD in Public International Law from University of Cambridge.
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| 20. | He did his post-graduate degree at University of Berlin, specialisizing in public international law.
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