Limits on the cosmological abundance of supermassive compact objects from a search for multiple imaging in compact radio sources.
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National Radio Astronomy Observatory | D. R. Henstock | C. I. O. Technology. | A. Readhead | P. Wilkinson | P. Augusto | Universidade da Madeira | T. Pearson | R. Vermeulen | I. Browne | I. Browne | R. U. O. Manchester | O. Observatory | Jodrell Bank Observatory | A. Polatidis | W. Xu | G. Taylor | C. Technology. | Netherlands Foundation for Radioastronomy