1. Wild JJ, HD Crawford, JM Reid: Visualization of the excised human heart by means of reflected ultrasound or echography. Am Heart J 54:903, 1957.
2. Johnson RL, SA Goss, V Maynard, JK Brady, LA Frizzell, WD O’Brien Jr, F Dunn: Elements of tissue characterization. Part I. Ultrasonic propagation properties. Ultrasonic Tissue Characterization II (Linzer M, ed.), p 19. NBS Spec Publ 525. US Government Printing Office, Washington, 1979.
3. Goss SA, RL Johnston, F Dunn: Comprehensive compilation of empirical ultrasonic properties of mammalian tissues. J Acoust Soc Am 64:423, 1978.
4. Chivers RC, RJ Parry: Ultrasonic velocity and attenuation in mammalian tissues. J Acoust Soc Am 63:940, 1978.
5. Wells PNT: Absorption and dispersion of ultrasound in biological tissue. Ultrasound Med Biol 1:369, 1975.