Não informado. (1977). IABSE Structures. International Association for Bridge and Structural Engineering.
Lua i Stíl Chicago (17ú heag.)Não informado. IABSE Structures. Zurich, Suíça: International Association for Bridge and Structural Engineering, 1977.
Lua MLA (8ú heag.)Não informado. IABSE Structures. International Association for Bridge and Structural Engineering, 1977.
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