Here:

http://www.nature.com/news/2007/070820/full/448974a.html

To quote:

Schisler was not the only one to "pre-discover" a pulsar, though, according to Bell Burnell. "There are actually a lot of stories," she says. In the 1950s, a woman visiting the observatory at the University of Chicago, Illinois, pointed out that there was a regularly pulsating source of visible light in the Crab Nebula. Elliot Moore, an astronomer at the university, dismissed the woman's claim, telling her that all stars seem to flicker. Another radio astronomer she knows of will, after a drink or two, confess to having dismissed observations of a pulsating source as the result of faulty equipment. "He's a bit embarrassed now," says Bell Burnell.