1. Z. P. Shul'man, B. M. Khusid, and I. V. Fain, Inzh.-Fiz. Zh.,68, No. 1, 75?85 (1995).
2. J. W. Strohbehn and R. B. Roemer, IEEE Trans.,BME-31, 136?149 (1984).
3. Yu. S. Kudryavtsev and A. V. Kolmykov, Med. Radiolog., No. 2, 3?9 (1990).
4. R. J. Dickinson, IEEE Trans.,BME-31, 120?125 (1984).
5. M. Ettenberg, RCA Review,46, 510?527 (1985).