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dAmore F. and V. Liberatore, The list update problem and the retrieval of sets, Theoretical Computer Science 130 (1994) 101-123. 0304-3975/94/$07.00 0 1994-Elsevier Science B.V. All rights reserved SSDI 0304-3975(94)00010-Gdoi:10.1016/0304-3975(94)00010-7 fatcat:nldvd5urnvb3jaimjsdtnge3ri