1. Wild, J.N., Neal, D.: The use of high frequency ultrasonic waves for detecting changes of living tissues. Lancet1:655, 1951
2. Kobayashi, T.: Ultrasonic diagnosis of breast cancer. Ultrasound Med. Biol.1:383, 1975
3. Kobayashi, T.: Current status of interpretative criteria for breast tumour. In Ultrasonic Examination of the Breast, J. Jellins, T. Kobayashi, editors, New York, J. Wiley & Sons, Ltd., 1983, pp. 57–64
4. Kelly-Fry, E., Franklin, T.D., Gallagher, H.S.: Ultrasound visualisation of excised breast tissue. Proc. of the Acoustical Soc. of America, Washington, D.C., 1971
5. Jellins, J., Kossof, G.: Velocity compensation in water-coupled breast echography. Ultrasonics11:223, 1973