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Crespi-Reghizzi et al, S. (1970) Crespi-Reghizzi et al, S. "A Language for Treating Graphs" Reynolds, John (1970) Reynolds, John "GEDANKEN A Simple Typeless Language Based on the Principle of Completeness and the Reference Concept" Sitton, G. A.: (1970) Sitton, G. A.: "Operations on generalzed arrays with the GENIE compiler"