(1991). Tunnelling '91: The 6th international symposium./ London, England, 14.-18.4.1991. Elsevier.
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Citação norma Chicago
Tunnelling '91: The 6th International Symposium./ London, England, 14.-18.4.1991. London: Elsevier, 1991.
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Citação norma MLA
Tunnelling '91: The 6th International Symposium./ London, England, 14.-18.4.1991. Elsevier, 1991.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.