= The Basics (author-hosted chapter preview)
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Online text: https://www.math.uni-hamburg.de/home/diestel/books/graph.theory/preview/Ch1.pdf
Cited passages: Section 1.7, printed page 20 and Figure 1.7.3: contracting an edge to one vertex; Section 1.7, printed pages 18–21: subdivisions and Proposition 1.7.3(i); Section 1.7, printed pages 19–20, Corollary 1.7.2: finite minors by deletions and contractions.
Cited passages: Diestel, Graph Theory, Section 1.1; Diestel, Graph Theory, Section 1.5.
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