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The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002VILLATA, M; RAITERI, C. M; HAGEN-THORN, V. A et al.Astronomy and astrophysics (Berlin. Print). 2004, Vol 421, Num 1, pp 103-114, issn 0004-6361, 12 p.Article

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