@book { ShadowVolumesundShadowMappingmitOpenGLGLSL,
    title = "Shadow Volumes und Shadow Mapping mit OpenGL/GLSL",
    author = "Andy {Reimann}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842818668",
    url = "https://m.diplom.de/document/228550"
}