1. Cohen-Or, D., Chrysanthou, Y.L., Silva, C.T., and Durand, F., A survey of visibility for walkthrough applications, IEEE Trans. Visualization Comput. Graph., 2003, vol. 9, no. 3, pp. 412–431.
2. Airey, J., Increasing Update Rates in the Building Walkthrough System with Automatic Model-Space Subdivision and Potentially Visible Set Calculations, PhD thesis, University of North Carolina, Chappel Hill, 1991.
3. Teller, S.J., Visibility Computations in Densely Occluded Polyhedral Environments. PhD thesis, University of California at Berkeley, 1992.
4. Luebke, D. and Georges, C., Portals and mirrors: Simple, fast evaluation of potentially visible sets, Proc. of the 1995 Symposium on Interactive 3D Graphics, 1995, pp. 105–106.
5. Durand, F., Drettakis, G., Thollot, J., and Puech, C., Conservative visibility preprocessing using extended projections, Proc. of the 27th Annual Conference on Computer Graphics and Interactive Techniques, 2000, pp. 239–248.