Pascal's Triangle In The Book of Numbers, pp.68-70, 1996. ,
Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing, p.10, 1972. ,
Mathematical Methods for Physicists, pp.307-308, 1985. ,
Real and complex analysis New York: McGraw- Hill. p. 1, 1987. ,
Finite Difference, From MathWorld ,
An Introduction to the Calculus of Finite Differences, p.5, 1954. ,
The On-Line Encyclopedia of Integer Sequences, 1996-present https ,
Numerical Methods: Analysis, Algebra, Ordinary Differential Equations p, p.59, 1977. ,