Franck, Lefèvre; Forget, François (6 de agosto de 2009). «Observed variations of methane on Mars unexplained by known atmospheric chemistry and physics». Nature. 460 (7256): 720–723. Bibcode:2009Natur.460..720L. PMID19661912. doi:10.1038/nature08228
Franck, Lefèvre; Forget, François (6 de agosto de 2009). «Observed variations of methane on Mars unexplained by known atmospheric chemistry and physics». Nature. 460 (7256): 720–723. Bibcode:2009Natur.460..720L. PMID19661912. doi:10.1038/nature08228
Franck, Lefèvre; Forget, François (6 de agosto de 2009). «Observed variations of methane on Mars unexplained by known atmospheric chemistry and physics». Nature. 460 (7256): 720–723. Bibcode:2009Natur.460..720L. PMID19661912. doi:10.1038/nature08228