"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.
"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.