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Llínea 7: |
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| == Referències == | | == Referències == |
− | * Hubble, Edwin Powell (1920). Photographic investigations of faint nebulae. Chicago, Ill., The University of Chicago Press. | + | |
| + | * Fool Me Twice: Fighting the Assault on Science in America. Harmony/Rodale. 11 de octubre de 2011. ISBN 9781609613204 |
| + | * Hubble, Edwin Powell (1920). Photographic investigations of faint nebulae. Chicago, Ill., The University of Chicago Press |
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| == Bibliografia == | | == Bibliografia == |