(1) R. F. Wagner, S. W. Smith, J. M. Sandrik, and H. Lopez, “Statistics of speckle in ultrasound B-scans”, IEEE Trans. Son. and Ultrason., Vol. 30, No. 3, pp. 156-163, May (1983)
(2) T. Mochizuki and M. Ito: “Smoothing method for three-dimensional display of the tissue using ultrasound - three-dimensional Median/Median Filter”, Trans. IEICE, Vol. J76-D-II, No. 11, pp. 2304-2315 (1993-11) (in Japanese)
望月剛· 伊東正安: “超音波による生体組織データの3次元表示のための平滑化処理 - 3次元メジアン·メジアンフィルタ”, 信学論,J76-D-II, 11, pp. 2304-2315 (1993-11)