Unidirectional acoustic probe based on the particle velocity gradienta) Yu, Shiduo ; Fernández Comesaña, Daniel ; Carrillo Pousa, Graciano ; Yang, Yixin ; Xu, Lingji Abstract Publication: Acoustical Society of America Journal Pub Date: June 2016 DOI: 10.1121/1.4952407 Bibcode: 2016ASAJ..139L.179Y