共 6 条
[1]
Boyle R., 1930, CAN J RES, V2, P3
[2]
COCHRAN D, 1944, GEN ELEC REV, V47, P39
[4]
ULTRASONIC LENSES AND TRANSMISSION PLATES
[J].
JOURNAL OF SCIENTIFIC INSTRUMENTS,
1945, 22 (12)
:238-243
[5]
GRUETZMACHER J, 1936, Z TECH PHYS, V17, P166
[6]
Piezoelectric crystal with ultrasonic convergence.
[J].
ZEITSCHRIFT FUR PHYSIK,
1935, 96 (5-6)
:342-349