P.M. Shankar, R. Molthen, V.M. Narayanan, J.M. Reid, V. Genis, F. Forsberg, C.W. Piccoli, A.E. Lindenmayer, B.B. Goldberg,
Studies on the use of non-Rayleigh statistics for ultrasonic tissue characterization Ultrasound in Medicine and Biology. ,vol. 22, pp. 873- 882 ,(1996) ,
10.1016/0301-5629(96)00080-4