κ-Minkowski spacetime and the star product realizations S. Meljanac, A. Samsarov, M. Stojić and Kumar S. Gupta Eur. Phys. J. C, 53 2 (2008) 295-309 Published online: 09 November 2007 DOI: 10.1140/epjc/s10052-007-0450-0