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By Reinhard Diestel.

Publisher: Springer (book); University of Hamburg author site (preview host).

Online text: diestel-graph-theory.com/Sample.pdf

Cited passages: Diestel, Graph Theory, Chapter 2, Exercise 23; Diestel, Graph Theory, Section 2.1, Theorem 2.1.1 and its lower-bound argument; Diestel, Graph Theory, fourth electronic edition, Section 2.1, definition of vertex cover.

Published in Springer, Graduate Texts in Mathematics 173.

Online text: webhomes.maths.ed.ac.uk/~v1ranick/papers/diestel1.pdf

The linked University of Edinburgh mirror is the third electronic edition, 2005. Supporting locators here refer to printed pp. 165–167 of that edition, rather than to differently paginated author-hosted previews or later editions.