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Birch, Paul (1991). "Terraforming Venus Quickly"(PDF). Journal of the British Interplanetary Society. 3 Ocak 2015 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 24 Eylül 2014.
Birch, Paul (1991). "Terraforming Venus Quickly"(PDF). Journal of the British Interplanetary Society. 3 Ocak 2015 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 24 Eylül 2014.