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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.
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.
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.
Lorentzos, N.A. and Johnson, Roger (1988) An extension of the relational model to support generic intervals. In: Schmidt, J.W. and Ceri, S. and Missikoff, M. (eds.) Advances in Database Technology: Proceedings of the International Conference on Extending Database Technology. Lecture Notes in Computer Science 303. Springer, pp. 528-542. ISBN 9783540190745.
Lorentzos, N.A. and Johnson, Roger (1987) TRAA model for a temporal relational algebra. In: Rolland, C. and Bodart, F. and Leonard, M. (eds.) Temporal Aspects in Information Systems: Proceedings of the IFIP Working Conference on Temporal Aspects in Information Systems. Elsevier.