1. Vladimir A. Sutilov, Physik des Ultraschalls, Springer Verlag, 1984, pp. 177.
2. Q.F. Zhou, J.H. Cha, Y. Huang, R. Zhang, W. Cao, J.M. Cannata, K.K. Shung, Nanocomposite matching layers for high frequency ultrasound transducers, In: IEEE Ultrasonics Symposium 3–6 October 2006, pp. 2365–2368.
3. L. Spanhel, E. Arpac, R. Nass, H. Schmidt, EP 0607213 B1, INM gGmbH, 09.10.1992.
4. E. Arpac, H. Krug, P. Müller, P. Oliviera, H. Schmidt, S. Sepeur, B. Werner, WO 98/51747 A1, INM gGmbH, 13.05.1997.
5. E. Arpac et. al., WO 99/52964, INM gGmbH, 09.04.1998.