6YODER. The Market for Ultrasonic Flowmeters Worldwide[ R] . Massachusetts, USA, 2005.
7SANDERSON, HEMP. Ultrasonic Flowmeters-A Review of the State of the Art [ C ]//International Conference on Advances in Flow Measurement Techniques. 1981:157 - 178.
8LYNNWORTH. Ultrasonic Measurements for Process Control: Theory, Techniques, Applications [ M ]. San Diego : Academic Press, 1989 : 111 - 243.
9DIMITRIJEVIC, PAVLVIC. Ultrasonic Fluid Flow Measurement Methods, An Overview[ J]. Facta Universitatis (NIS) Series: Electronics and Energetics, 1995,8 ( 2 ) : 299 - 315.
