1. Ando, M., Kawamura, H., Kageyama, K., and Tajitsu, Y., Film sensor device fabricated by a piezoelectric poly(L-lactic acid) film, Japanese Journal of Applied Physics, Vol. 51, No. 9S1 (2012), pp. 09LD14.
2. Ando, M., Kawamura, H., Kitada, H., Sekimoto, Y., Inoue, T., and Tajitsu, Y., Pressure-sensitive touch panel based on piezoelectric poly(L-lactic acid) film, Japanese Journal of Applied Physics, Vol. 52, No. 9S1 (2013), pp. 09KD17.
3. Courant, R., Hilbert, D., Methods of Mathematical Physics, Volume 1 (2004), pp. 69-82, Wiley-VCH.
4. Erdélyi, A., Magnus, W., Oberhettinger, F., and Tricomi, F. G., Tables of Integral Transforms, Volume I (1954), pp. 15, 73, McGraw-Hill.
5. Fukada, E., Piezoelectricity of wood, Journal of the Physical Society of Japan, Vol. 10, No. 2 (1955), pp. 149-154.