Book Section

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.

Levene, Mark and Loizou, G. (1988) A universal relation model for nested relations. 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. 294-308. ISBN 9783540190745.