About Ultrasonic beams focusing in piezoelectric crystals and ferroelectric ceramics by application of a nonuniform electric field
Ultrasonic beams focusing in piezoelectric crystals and ferroelectric ceramics by application of a nonuniform electric field- V.N.Belyi, N.S.Kazak V.K.Pavlenko, A.G.Mashchenko and F.M.Severin (NDT-net)