1. Akinde, M., Chatziantoniou, D., Johnson, T., Kim, S.: The MD-join: An operator for complex OLAP. In: Proc. ICDE, pp. 524–533 (2001)
2. Clauset, A., Shalizi, C.R., Newman, M.E.J.: Power-law distributions in empirical data. SIAM Review 51(4), 661–703 (2009)
3. Codd, E.F.: A relational model of data for large shared data banks. Commun. ACM 13, 377–387 (1970)
4. Dong, G., Libkin, L., Wong, L.: Local properties of query languages. Theor. Comput. Sci. 239, 277–308 (2000)
5. Goldwater, S., Griffiths, T.L., Johnson, M.: Producing power-law distributions and damping word frequencies with two-stage language models. J. Mach. Learn. Res. 12, 2335–2382 (2011)