1. J.R. Chen, Combinatorial Mathematics (Harbin Institute of Technology Press, Harbin, 2012). (in Chinese)
2. Discrete geometry.
http://en.wikipedia.org/wiki/Discrete_geometry
3. Generative.
http://en.wikipedia.org/wiki/Generative
4. Generative science.
http://en.wikipedia.org/wiki/Generative_science
5. H.W. Gould, Some generalizations of Vandermonde’s convolution. Am. Math. Mon. 63(2), 84–91 (1956)