title: Nonlinear acoustics in higher-order approximation: Comment.
abstract: Some useful expressions for the second- and third-order equations for harmonic generation of infinite plane acoustic waves in a nonlinear non-viscous fluid are corrected. The concern addressed in the present comment is to point out some typographical errors in the first-order velocity and pressure expressions intervening in the calculation of the secondorder nonlinear equations, as well as a miscalculation of the axial component of the third-order Lighthill tensor term and the resulting third-order velocity and pressure equations presented in that paper.
authors.forename: Farid G
authors.initials: FG
authors.lastname: Mitri
mesh_terms: D000042:Absorption; D000162:Acoustics; D000465:Algorithms; D017711:Nonlinear Dynamics; D012212:Rheology; D014463:Ultrasonography