Y. Zhuge, H. Garc\'ıa-Molina, J. Hammer, и J. Widom. SIGMOD '95: Proceedings of the 1995 ACM SIGMOD international conference on Management of data, стр. 316--327. New York, NY, USA, ACM, (1995)
M. Golfarelli, и S. Rizzi. DOLAP '98: Proceedings of the 1st ACM international workshop on Data warehousing and OLAP, стр. 3--9. New York, NY, USA, ACM, (1998)