The effective period and damping of a class of hysteretic structures. Iwan, W., D. and Gates, N., C. Earthquake Engineering and Structural Dynamics, 7(3):199-211, 1979. bibtex @article{
title = {The effective period and damping of a class of hysteretic structures},
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year = {1979},
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author = {Iwan, Wilfred D and Gates, Nathan C},
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