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.