Holt, Anatol W. "Program Organization and Record Keeping for Dynamic Storage Allocation" pp539-544

Popplewell, Cicely M. (1962) Popplewell, Cicely M. (Ed.) Information Processing 62, Proceedings of the 2nd IFIP Congress, Munich, Aug. 1962. North Holland Publ. Co., 1963.  

Languages mentioned Mem-theory {1961} Graph-based universal language