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- [7] RELATIVE COLORINGS AND 4-COLOR CONJECTURE/RE AMERICAN MATHEMATICAL MONTHLY, 1974, 81 (05): : 491 - 492
- [8] 13 COLORFUL VARIATIONS ON GUTHRIES 4-COLOR CONJECTURE AMERICAN MATHEMATICAL MONTHLY, 1972, 79 (01): : 2 - &
- [9] ENUMERATION PROGRAM FOR TRYING TO SETTLE 4-COLOR CONJECTURE NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (03): : A384 - A384