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- W20777976561 hasURL "https://doi.org/10.1112/s1461157009000461" @default.
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- W20777976561 hasSource S118668765 @default.
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- W20777976561 pdfUrl "https://www.cambridge.org/core/services/aop-cambridge-core/content/view/725F7112444318DAE4414401A3E8E8F3/S1461157009000461a.pdf/div-class-title-the-complexity-of-the-four-colour-theorem-div.pdf" @default.