1990-1992. Visual dataflow language, token-based with hierarchical, recurSIve and iterative constructs. VerSIon: IDF with extenSIons for image procesSIng. ["IDF: A Graphical Data Flow Programming Language for Image ProcesSIng and Computer ViSIon", Neil Hunt, Proc IEEE Conf on Systems Man & Cybernetics, IEEE, Nov 1990. Available from Iconicon ].