1. Auger, F. and Flandrin, P., 1995, Improving the readability of time-frequency and time-scale representations by reassignment methods, IEEE Trans. Signal Proc. 43(5), 1068?1089.
2. Bard, P.-Y., 1998, Microtremor measurement: A tool for site effect estimation? The effects of surface geology on seismic motion, In: Irikura, K., Kudo, K., Okada, H. and Sasatani, T. (eds.), Balkema, Rotterdam, pp. 1251?1279.
3. Bettig, B., Bard, P.-Y., Scherbaum, F., Riepl, J., Cotton, F., Cornou, C. and Hatzfeld, D., 2001, Analysis of dense array measurements using the modified spatial auto-correlation method (SPAC), Application to Grenoble area, Bull. Geof. Teor. Appl. 42, 3?4, 281?304.
4. Chatelain, J.L., Gu�guen, P., Guillier, B., Fr�chet, J., Bondoux, F., Sarrault, J., Sulpice, P. and Neuville, J.M., 2000, CityShark: A user-friendly instrument dedicated to ambient noise (microtremor) recording for site and building response studies, Seism Res Lett. 71, 6, 698?703.
5. Clough, R.W. and Penzien, J., 1993, Dynamics of structures. 2nd ed, MacGraw-Hill, Inc Editor, 739 pp.