Dennis G. Severance, Guy M. Lohman. Differential Files: Their Application to the Maintenance of Large Data Bases (Abstract). In James B. Rothnie Jr., editor, Proceedings of the 1976 ACM SIGMOD International Conference on Management of Data, Washington, D.C., June 2-4, 1976. pages 43, ACM, 1976. [doi]
Abstract is missing.