1. R. T. DeHoff and F. N. Rhines, Editors, Quantitative Microscopy, McGraw-Hill, New York, 1968.
2. J. W. Gibbs, The Scientific Papers of J. Willard Gibbs, Dover Publications, New York, 1961, p. 229.
3. R. L. Fullman, Trans. AIME, 197, 1953, p. 447.
4. F. Chayes, Petrographic Modal Analysis, John Wiley & Sons, Inc., New York, 1956.
5. J. E. Hilliard, in Quantitative Microscopy, R. T. DeHoff and F. N. Rhines, Editors, McGraw-Hill, New York, 1968, Chapter 3.