Fast global illumination baking via ray-bundles. - Yusuke Tokuyoshi; Takashi Sekine; Shinji Ogaki (SIGGRAPH Asia Sketches, 2011)

Adaptive Ray-bundle Tracing with Memory Usage Prediction: Efficient Global Illumination in Large Scenes. - Yusuke Tokuyoshi; Takashi Sekine; Tiago da Silva; Takashi Kanai (Comput. Graph. Forum, 2013)