Optical polarization of high-energy BL Lacertae objects T. Hovatta, E. Lindfors, D. Blinov, V. Pavlidou, K. Nilsson, S. Kiehlmann, E. Angelakis, V. Fallah Ramazani, I. Liodakis, I. Myserlis et al. (2 more) A&A, 596 (2016) A78 Published online: 02 December 2016 DOI: 10.1051/0004-6361/201628974