AMBIT/G
["An Example of the Manipulation of Directed Graphs in the AMBIT/G Programming Language", C. Christensen, in Interactive Systems for Experimental Applied Mathematics, M. Klerer et al, eds, Academic Press 1968, pp. 423-435].
MegaLexica
["An Example of the Manipulation of Directed Graphs in the AMBIT/G Programming Language", C. Christensen, in Interactive Systems for Experimental Applied Mathematics, M. Klerer et al, eds, Academic Press 1968, pp. 423-435].