@article{kd03,
    author = {Kirsch, Florian and Döllner, Jürgen},
    journal = {Journal of WSCG},
    title = {Real-Time Soft Shadows Using a Single Light Sample},
    year = {2003},
    number = {1--3},
    pages = {255--262},
    volume = {11},
    publisher = {Václav Skala -- UNION Agency},
}