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Photometric monitoring of three BL Lacertae objects in 1993-1998

J. M. Bai, G. Z. Xie, K. H. Li, X. Zhang and W. W. Liu

Astron. Astrophys. Suppl. Ser., 136 3 (1999) 455-460

DOI: https://doi.org/10.1051/aas:1999227

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