1. Morgan, D.: Surface Acoustic Wave Filters, Academic Press; 2 edition (2007)
2. Mohan, S.: The 5G effect on RF filter technologies. IEEE Trans Semiconductors Manuf. 30(4), 494–499 (2017)
3. Robert, A., De, V.: Acousto-electric filter utilizing surface wave propagation in which the center frequency is determined by a conductivity pattern resulting from an optical image (1969) uS Patent 3,446,975. http://www.google.tl/patents/US3446975
4. Zhu, J., Lu, Y., Kosinski, J., Pastore, R.: Programmable surface acoustic wave (saw) filter (2003) uS Patent 6,541,893. https://www.google.co.in/patents/US6541893
5. Hong, J.: Method and apparatus for modifying acoustic wave characteristics, (2004) uS Patent 6,710,510. http://www.google.com.pg/patents/US6710510