A cosmological model with Einstein-de Sitter local metric and three-torus spatial topology predicts multiple images of cosmic sources like QSOs. Assuming that our Galaxy, in an early stage of its evolution, was such a source, the authors look in a quasar catalog for the ones that can possibly be interpreted as images of the Galaxy in that stage, expecting to fit a particular realization of that model.
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Fagundes et al. (1987) studied this question.
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