Programming Languages for Non-Numeric Processing - 1: examples of symbol manipulation in the AMBIT Programming Language. - Carlos Christensen (ACM National Conference, 1965)

On the implementation of AMBIT, a language for symbol manipulation. - Carlos Christensen (Commun. ACM, 1966)

An example of the manipulation of directed graphs in the AMBIT/G programming language. - Carlos Christensen (Symposium on Interactive Systems for Experimental Applied Mathematics, 1967)

An introduction to AMBIT/L, a diagrammatic language for list processing. - Carlos Christensen (SYMSAC, 1971)

IAM, a system for interactive algebraic manipulation. - Carlos Christensen; Michael Karr (SYMSAC, 1971)