Abstract

References
1.
Boag J.W.
(1977 ) British Journal of Radiology 50 , 84 –92
2.
Mountford R.A.
, &
Wells P.N.T.
(1972 ) Physics in Medicine and Biology 17 , 261 –269
3.
Wells P.N.T.
(1977 ) Biomedical Ultrasonics. Academic Press , London
