@inproceedings{gutierrez05nonlinear,
    author = {Diego Gutierrez and Adolfo Mu\~{n}oz and Oscar Anson and Francisco Seron},
    title = {Non-Linear Volume Photon Mapping},
    booktitle = {Rendering Techniques (Proceedings of the Eurographics Symposium on Rendering Techniques,
               Konstanz, Germany, June 29 - July 1, 2005)},
    pages = {291--300},
    year = {2005},
    publisher = {Eurographics Association}
}