@article{Klosowski:2001:ECV,
	author={James T. Klosowski and Claudio T. Silva},
	journal={IEEE Transactions on Visualization and Computer Graphics},
	number=4,
	pages={365-379},
	title={Efficient Conservative Visibility Culling Using the Prioritized-Layered Projection Algorithm},
	volume=7,
	year=2001,
}