ULTRASONICS, vol. 54, no. 8, page. 2184 - 2192, 2014-12
ULTRASONICS, vol. 50, no. 3, page. 340 - 346, 2010-03
ULTRASONICS, vol. 54, no. 6, page. 1480 - 1487, 2014-08
ULTRASONICS, vol. 50, no. 3, page. 335 - 339, 2010-03