1. J. A. Bergstra and J. V. Tucker. Initial and final algebra semantics for data type specification: Two characterization theorems. SIAM Journal of Computing, Vol 12(No. 2):366–387, May 1983.
2. Also published as Technical Report 274;CD Boyer,1989
3. Lecture Notes in Computer Science;R Camposano,1989
4. H. Ehrig and B. Mahr. Fundamentals of Algebraic Specification 1; Equations and Initial Semantics, volume 6 of EATCS Monographs on Theoretical Computer Science. Springer-Verlag, 1985.
5. J. A. Goguen, J. W. Thatcher, and E. G. Wagner. An initial algebra approach to the specification, correctness and implementation of abstract datatypes. In R. Yeh, editor, Current Trends in Programming Methodology, chapter 5, pages 80–149. Prentice-Hall, Englewood Cliffs, N.J. 07632, 1978.