Background levels of methane in Mars atmosphere show strong seasonal variations - Webster, C. R., Mahaffy, P. R., Atreya, S. K., Moores, J. E., Flesch, G. J., Malespin, C., McKay, C. P., Martinez, G., Smith, C. L., Martin-Torres, J., Gomez-Elvira, J., Zorzano, M.-P., Wong, M. H., Trainer, M. G., Steele, A., Archer, D., Sutter, B., Coll, P. J., Freissinet, C., Meslin, P.-Y., Gough, R. V., House, C. H., Pavlov, A., Eigenbrode, J. L., Glavin, D. P., Pearson, J. C., Keymeulen, D., Christensen, L. E., Schwenzer, S. P., Navarro-Gonzalez, R., Pla-Garcia, J., Rafkin, S. C. R., Vicente-Retortillo, A., Kahanpää, H., Viudez-Moreiras, D., Smith, M. D., Harri, A.-M., Genzer, M., Hassler, D. M., Lemmon, M., Crisp, J., Sander, S. P., Zurek, R. W., Vasavada, A. R. (American Association for the Advancement of Science (AAAS), 2018)
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