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1. The Four Colour Problem by Ore, Oystein Publication: New York Academic Press 1967 Date: 1967 Availability: Items available: School of Theoretical Physics Library [511.51 ORE] (1),
2. Theory of graphs. by Ore, Oystein Publication: Rhode Isl. American mathematical society 1962 Date: 1962 Availability: Items available: School of Theoretical Physics Library [511.51 ORE] (1), Lost (1),