On Spatial Quantization of Color Images. - Jens Ketterer; Jan Puzicha; Marcus Held; Martin Fischer 005; Joachim M. Buhmann; Dieter W. Fellner (ECCV (1), 1998)

Dithered Color Quantization. - Joachim M. Buhmann; Dieter W. Fellner; Marcus Held; Jens Ketterer; Jan Puzicha (Comput. Graph. Forum, 1998)

On spatial quantization of color images. - Jan Puzicha; Marcus Held; Jens Ketterer; Joachim M. Buhmann; Dieter W. Fellner (IEEE Trans. Image Process., 2000)