Gu X, Cegla F. The Effect of Internal Pipe Wall Roughness on the Accuracy of Clamp-On Ultrasonic Flowmeters. IEEE Transactions on Instrumentation and Measurement. 2018 May 16(99):1-8.
 Sun Y, Zhang T, Zheng D. New Analysis Scheme of Flow-Acoustic Coupling for Gas Ultrasonic Flowmeter with Vortex near the Transducer. Sensors. 2018;18(4):1151.
 Fan Z, Jiang W, Wright WM. Non-contact ultrasonic gas flow metering using air-coupled leaky Lamb waves. Ultrasonics. 2018 Sep 1;89:74-83.
 Chen Q, Li W, Wu J. Realization of a multipath ultrasonic gas flowmeter based on transit-time technique. Ultrasonics. 2014 Jan 1;54(1):285-90.
 Zhu WJ, Xu KJ, Fang M, Shen ZW, Tian L. Variable ratio threshold and zero-crossing detection based signal processing method for ultrasonic gas flow meter. Measurement. 2017 Jun 1;103:343-52.
 Luca A, Marchiano R, Chassaing JC. Numerical simulation of transit-time ultrasonic flowmeters by a direct approach. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 2016 Jun;63(6):886-97.
 J. Kocbach, Finite Element Modeling of Ultrasonic Piezoelectric Transducers: Influence of geometry and material parameters on vibration, response functions and radiated field, Department of Physics, University of Bergen, 2000 sep.
 Garcia JA. A Novel Ultrasonic Method to Quantify Bolt Tension. University of South Florida; 2012.
 Eccardt PC, Landes H, Lerch R. Applications of finite element simulations to acoustic wave propagation within flowing media. International Journal of Computer Applications in Technology. 1998 Jan 1;11(3-5):163-9.
 Pierce AD. Wave equation for sound in fluids with unsteady inhomogeneous flow. The Journal of the Acoustical Society of America. 1990 Jun;87(6):2292-9.
 Astley RJ. A finite element, wave envelope formulation for acoustical radiation in moving flows. Journal of Sound and Vibration. 1985 Dec 22;103(4):471-85.
 Deng Q, Fan Y, Wang L, Xiong Z, Wang H, Li Y, Zhang Q, Kawasaki A, Jiang W. Effects of polarization on mechanical properties of lead zirconate titanate ceramics evaluated by modified small punch tests. Japanese Journal of Applied Physics. 2011 Dec 28;51(1R):011501.
 IRE I. Standards on piezoelectric crystals: determination of the elastic, piezoelectric, and dielectric constants. Proc. IRE. 1958;46:764-78.
 Deü JF, Larbi W, Ohayon R. Piezoelectric structural acoustic problems: Symmetric variational formulations and finite element results. Computer Methods in Applied Mechanics and Engineering. 2008 Mar 15;197(19-20):1715-24.
 Cheeke JD. Fundamentals and applications of ultrasonic waves. CRC press; 2016 Apr 19.
 COMSOL A. Acoustics Module User’s Guide. COMSOL AB. 2007.