1987

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.

1988

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.

1992

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.