1. Kopal, Z.: Numerical Analysis, Chap. III, Numerical Differentiation, pp. 87 to 118. New York: John Wiley 1955.
2. Salzer, H. E.: A Generalization of Divided Differences, with Applications (unpublished thesis, copy available on order from University Microfilms, Inc., Ann. Arbor, Mich.), pp. 153?154.
3. Hildebrand, F. B.: Introduction to Numerical Analysis, pp. 64?68. New York: McGraw-Hill 1956.
4. Salzer, H. E.: Table of Coefficients for Obtaining the First Derivative Without Differences. National Bureau of Standards, Applied Mathematics Series, no. 2, Apr. 1948, 20 pp.
5. Salzer, H. E., andP. T. Roberson: Table of Coefficients for Obtaining the Second Derivative Without Differences. San Diego: Convair Astronautics 1957. 25 pp.