@inproceedings{RR99,
 author = {Rauber, T. and R\"{u}nger, G.},
 title = {{Matrix Computations behind the Hierarchical Radiosity method}},
 booktitle = {Proc. of the 13th Annual ACM Symp. on Applied Computing (SAC`99), Special Track on        Scientific Computing},
 year = {1999},
 isbn = {1-58113-086-4},
 publisher = {ACM},
}