1. Backus, J. (78). Can programming be liberated from the von neumann’s style? a functional style and its algebra of programs. Communications of the ACM,21(8).
2. Backus, J., Williams, J., and Wimmers, E. (1990). An introduction to the programming language fl. In Turner, D., editor, Research Topics in Functional Programming. Addison-Wesley.
3. Backus, J., Williams, J., Wimmers, E., Lucas, P.,, and Aiken, A. (1989). Fl language manual, parts 1 and 2. RJ 7100 (67163), IBM Research Report.
4. Bartels, r., Beatty, J., and Barsky, B. (1987). An Introduction to Splines for Use in Computer Graphics Geometric Modeling. Morgan Kaufmann.
5. Bernardini, F. (1991). Integration of polynomials over n-dimensional polyhedra. Computer Aided Design, 23 (1).