sentences:  In November 1995, the scientists published their findings in the journal "Nature"; the paper has since been cited over 1,000 times.Since that date, over 700 exoplanet candidates have been identified, and most have been detected by Doppler search programs based at the Keck, Lick, and Anglo-Australian Observatories (respectively, the California, Carnegie and Anglo-Australian planet searches), and teams based at the Geneva Extrasolar Planet Search.Beginning in the early 2000s, a second generation of planet-hunting spectrographs permitted far more precise measurements.