Utsu, T., Ogata, Y., and Matsu'ura, R.S. -LRB- / O1995 / O-RRB- '' The centenary of the Omori formula for a decay law of aftershock activity ", Journal of Physics of the Earth, vol.
Utsu, T., Ogata, Y., and Matsuura, R.S. -LRB- / O1995 / O-RRB- '' The centenary of the Omori formula for a decay law of aftershock activity ", Journal of Physics of the Earth, vol.