@inproceedings{conf/cikm/LiW96,
        title = {A Data Model for Supporting On-Line Analytical Processing.},
        author = {Chang Li and Xiaoyang Sean Wang},
        booktitle = {CIKM},
        crossref = {conf/cikm/96},
        pages = {81-88},
        publisher = {ACM},
        year = 1996,
        url = {http://dblp.uni-trier.de/db/conf/cikm/cikm96.html#LiW96},
        ee = {http://doi.acm.org/10.1145/238355.238444},
	cdrom = {CIKM1996/P081.pdf},
	date = {2002-12-05},
	description = {dblp},
	biburl = {http://www.bibsonomy.org/bibtex/203354d9119ffdee9cb86606c788dc501/schmitz},
	keywords = {database algebra olap model relational folksonomy}
}

@article{journals/tods/OzsoyogluOM87,
        title = {Extending Relational Algebra and Relational Calculus with Set-Valued Attributes and Aggregate Functions.},
        author = {Gultekin Özsoyoglu and Z. Meral Özsoyoglu and Victor Matos},
        journal = {ACM Trans. Database Syst.},
        number = 4,
        pages = {566-592},
        volume = 12,
        year = 1987,
        url = {http://dblp.uni-trier.de/db/journals/tods/tods12.html#OzsoyogluOM87},
        cite = {...},
	ee = {db/journals/tods/OzsoyogluOM87.html},
	cdrom = {TODS12/P566.PDF},
	date = {2006-04-03},
	description = {dblp},
	biburl = {http://www.bibsonomy.org/bibtex/2f0be8fe287119ee48c54de35375fc2be/schmitz},
	keywords = {algebra folksonomy database relational}
}