Abstract
References
1.
1.
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: Diagnostic Ultrasonics Principles and Use of Instruments.
New York , John Wiley & Sons , 1981 , pp 75 -75 , 310 -310 , 319 -319 .
2.
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DuBose TJ
: A simple test of excessive B scanner transducer ring . Med Ultrasound
1983 ;7 :169 -172 .