Não informado. (1977). IABSE Surveys. International Association for Bridge and Structural Engineering.
Chicago-referens (17:e uppl.)Não informado. IABSE Surveys. Zurich, Suíça: International Association for Bridge and Structural Engineering, 1977.
MLA-referens (8:e uppl.)Não informado. IABSE Surveys. International Association for Bridge and Structural Engineering, 1977.
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