Ru Diger Wolfrum Books

Legitimacy in international law

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Does international law lack legitimacy in general? Has international law or a part of it yielded to the facts of power? What is the relevance of non-enforcement or failure to obey for the legitimac...

Legitimacy in international law

By Volker Ro Ben, Ru Diger Wolfrum

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Max Planck yearbook of United Nations law

By Armin Von Bogdandy, Christiane Philipp, Ru Diger Wolfrum

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.