@article {3953,
	title = {Upper and Lower Bounds on the Cost of a Map-Reduce Computation},
	journal = {ArXiv},
	volume = {abs/1206.4377},
	year = {2012},
	url = {http://arxiv.org/abs/1206.4377},
	author = {Foto N. Afrati and Anish Das Sarma and Semih Salihoglu and Jeffrey D. Ullman}
}
