1. Eds. Coude du Foresto, V., Gelino, D.M., Ribas, I., “Pathways towards habitable planets”, ASP Conference Series volume 230
2. A European Roadmap for Exoplanets (EP-RAT), webpage (as of March, 2014): http://sci.esa.int/eprat
3. Deroo, P., Swain, M.R., Tinetti, G., Griffith, C., Vasisht, G., Deming, D., Henning, T., Beaulieu, J.-P., “Thesis: A Combined-light Mission For Exoplanet Molecular Spectroscopy”, American Astronomical Society, AAS Meeting #215, #327.06; Bulletin of the American Astronomical Society, Vol. 42, p.424
4. http://sci.esa.int/sre-fa/47037-exoplanet-spectroscopy-mission-esm/
5. Puig, L., Isaak, K.G., Linder, M., Escudero-Sanz, I., Martin, D., Crouzet, P-E., Gaspar-Venancio, L., Zuccaro-Marchi, A., ‘Status of the assessment phase study of the ESA M3 mission candidate EChO”, Proc. SPIE Astronomical Telescopes and Instrumentation (2012)