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A Quarterly Bulletin of the IEEE Computer Society Technical Committee on Data Engineering
Lorentzos, N.A. and Johnson, Roger (1988) Requirements specification for a temporal extension to the relational model. A Quarterly Bulletin of the IEEE Computer Society Technical Committee on Data Engineering 11 (4), pp. 26-33.
IEEE Transactions on Knowledge and Data Engineering
Johnson, Roger and Lorentzos, N.A. (1992) Comments on 'extensions to SQL for historical databases'. IEEE Transactions on Knowledge and Data Engineering 4 (4), ISSN 1041-4347.
Information Systems Journal
Lorentzos, N.A. and Johnson, Roger (1988) Extending relational algebra to manipulate temporal data. Information Systems Journal 13 (3), pp. 289-296. ISSN 1365-2575.