title: Comment on "Free vibration analysis of laminated piezoceramic hollow spheres".
authors.forename: G R
authors.initials: GR
authors.lastname: Buchanan
authors.forename: G R
authors.initials: GR
authors.lastname: Ramirez
mesh_terms: D000162:Acoustics; D002516:Ceramics; D020342:Finite Element Analysis; D006801:Humans; D014732:Vibration