Wilson, Robert A. <br/><br/>
Graphs, colourings and the four-colour theorem   

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 - Oxford  Oxford University Press  2004 
 - viii, 141p. Bibl. Index 
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<br/><br/><label>ISBN: </label>9780198510628 
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<br/><br/><label>Dewey Class. No.: </label>511.5  / W752.GC