Optical and radio variability of BL Lacertae H. Gaur, A. C. Gupta, R. Bachev, A. Strigachev, E. Semkov, P. J. Wiita, A. E. Volvach, M. F. Gu, A. Agarwal, I. Agudo et al. (10 more) A&A, 582 (2015) A103 Published online: 20 October 2015 DOI: 10.1051/0004-6361/201526536