Short communication Center-cut for color-image quantization. - Gregory Joy; Zhigang Xiang (Vis. Comput., 1993)

Color image quantization by agglomerative clustering. - Zhigang Xiang; Gregory Joy (IEEE Computer Graphics and Applications, 1994)

Reducing false contours in quantized color images. - Gregory Joy; Zhigang Xiang (Comput. Graph., 1996)