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Nishiyama, M., Mugurama, H. and Watanabe, F. 1989. Hysteretic restoring force characteristics of unbounded prestressed concrete framed structure under earthquake load. Bulletin of the New Zealand Society for Earthquake Engineering. 22, 2 (Jun. 1989), 112–121. DOI:https://doi.org/10.5459/bnzsee.22.2.112-121.