1. Satyanarayana, U Biochemistry, 6th ed., Book and Allied, Calcutta, 2000, 65
2. Nithiyanantham, S., Palaniappan, L., Acta Ciencia Indica 2006, 37, 392
3. Mulders, N.; Molz, E.; Beamish, J. R., Phys. Rev. 1993, 48, 6293–6301
4. Ludwig, G. D., J. Acoust. Soc. Am. 1950, 22, 862
5. Singh, A. K.; Behari, J., Ind. J. Pure Appl. Phys. 1994, 32, 528