1. Satyanarayana, U. (2000). Biochemistry. 6th ed. Calcutta: Book and Allied, p. 65
2. Palaniappan, L., & Nithiyanantham, S. (2006). Acta Ciencia Indica, 37, 387.
3. Mulders, N., Molz, E., Beamish, J. R. (1993). Physical Review, 48, 6293.
4. Ludwig, G. D. (1950). Journal of the Acoustical Society of America, 22, 862.
5. Singh, A. K., & Behari, J. (1994). Indian Journal of Pure Applied Physics, 32, 528.