Bibcode
                                    
                            Alonso, R.
    Bibliographical reference
                                    Lecture Notes and Essays in Astrophysics, vol. 4, Proceedings of the conference held 7-11 September, 2009 at Ciudad Real (Spain). Edited by A. Ulla and M. Manteiga. Tórculo Press (Vigo, Spain). ISBN: 978-84-936098-8-7, p. 43-57.
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                        12
            
                        2010
            
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                            Description
                                    Several techniques are achieving nowadays the precision levels required
to detect few-Earth-mass planets, but still a fruitful path needs to be
explored in order to detect a planet like the Earth orbiting inside the
habitable zone of a star. We summarize the different approaches followed
to reach this goal, and highlight their achievements.