1. Intransitive indifference with unequal indifference intervals;Fishburn;J. Math. Psych.,1970
2. P.C. Fishburn, Interval Orders and Interval Graphs (Wiley, New York).
3. Norbert Wiener on the Theory of Measurement;Fishburn;J. Math. Psych.,1914
4. Representation and Enumeration of Interval Orders and Semiorders;Greenough,1976