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Optical observations of five X-ray selected BL Lacertae objects

M. Villata, C. M. Raiteri, M. D. Popescu, G. Sobrito, G. De Francesco, L. Lanteri and L. Ostorero

Astron. Astrophys. Suppl. Ser., 144 3 (2000) 481-485

DOI: https://doi.org/10.1051/aas:2000222

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