Não informado. (1999). The Leading Edge. Society of Exploration Geophysicists.
Lua i Stíl Chicago (17ú heag.)Não informado. The Leading Edge. Tulsa, Okla: Society of Exploration Geophysicists, 1999.
Lua MLA (8ú heag.)Não informado. The Leading Edge. Society of Exploration Geophysicists, 1999.
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