1. T. K. Stanton et al., J. Acoust. Soc. Am. 122, 3167 (2007).
2. V. A. Burov and A. A. Shmelev, Akust. Zh. 55, 466 (2009) [Acoust. Phys. 55, 482 (2009)].
3. V. A. Burov et al., Akust. Zh. 54, 712 (2008) [Acoust. Phys. 54, 615 (2008)].
4. V. A. Burov et al., Akust. Zh. 52, 760 (2006) [Acoust. Phys. 52, 655 (2006)].
5. J. P. Paulo et al., Appl. Acoust. 70, 556 (2009).