The Convergent Property of Surface Acoustic Waves Generated by Concave Transducers on Anisotropic Crystal Surfaces Ai, Chia-Yu ; Tzou, Chyr-Pwu ; Wang, Shou-Yih ; Hwang, Dah-Min Abstract Publication: Chinese Journal of Physics Pub Date: February 1979 Bibcode: 1979ChJPh..17...12A