R-band imaging of the host galaxies of RGB BL Lacertae objects K. Nilsson, T. Pursimo, J. Heidt, L. O. Takalo, A. Sillanpää and W. Brinkmann A&A, 400 1 (2003) 95-118 Published online: 24 February 2003 DOI: 10.1051/0004-6361:20021861