Here you go:
Somerville, P. and Graves, R. (1993), Conditions that give rise to unusually large long period ground motions. The Structural Design of Tall Buildings, 2: 211–232.
Somerville, P. and Graves, R. (1993), Conditions that give rise to unusually large long period ground motions. The Structural Design of Tall Buildings, 2: 211–232.
Code:
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