In a 1996 issue of Scientific American, in a box adjoining an article by another author, Carl Sagan reported on a number of signals collected by radioastronomy (probably SETI funded by The Planetary Society), complaining they did not repeat and had a strange statistics, in which they were more frequent in the galactic plane (meaning it wasn't just one or two). Those statements were later explained away by saying it could have been noise in the electronics.
However, apart from the "Wow! signal"
http://en.wikipedia.org/wiki/Wow%21_signal
I didn't hear again about plausible or dubious multiple signals.
Does anyone know a link or links to reliable information on what we've got so far?
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