SALT long-slit spectroscopy of LBQS 2113-4538: variability of the Mg II and Fe II component K. Hryniewicz, B. Czerny, W. Pych, A. Udalski, M. Krupa, A. Świȩtoń and J. Kaluzny A&A, 562 (2014) A34 Published online: 04 February 2014 DOI: 10.1051/0004-6361/201322487