Magnetocaloric effect in spin-1/2 XX chains with three-spin interactions M. Topilko, T. Krokhmalskii, O. Derzhko and V. Ohanyan Eur. Phys. J. B, 85 8 (2012) 278 Published online: 08 August 2012 DOI: 10.1140/epjb/e2012-30359-8