Gravitational Lens Candidates in the HST Survey of BL Lac Objects

DOI: 10.1023/A:1017011111482 Bibcode: 1999Ap&SS.269..669T

Falomo, R.; Treves, A.; Urry, C. M.; Giovannini, G.; Scarpa, R.; Pesce, J. E.; Webster, R.; O'Dowd, M.

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