"Mechanical filters in electronics", New York: Wiley, 1983 ISBN 0-471-08919-2*Kasai, Yoshihiko; Hayashi, Tsunenori, "Automatic frequency adjusting method for mechanical resonators", , filed 1980, issued 1983.
* Kasai, Yoshihiko; Hayashi, Tsunenori, "Automatic frequency adjusting method for mechanical resonators", , filed 1980, issued 1983.