1. Cady, W. G., Piezoelectricity. McGraw-Hill Book Co. Inc., New York 1946.
2. Mason, W. P., Piezoelectric crystals and their application to Ultrasonics, D. Van Nostrand Co. Inc., New York 1950.
3. Paria, G., J. Sci. Engng. Res. Kharagpur4 (1960) 386.
4. Jerrad, R. P., Quart. Appl. Math.18 (1960) 173.
5. Timoshenko, S. and J. N. Goodier, Theory of Elasticity McGraw-Hill Book Co. Inc. (Asian Students’ Edition) 1951, p. 35–43.