Fradkin-Bacry-Ruegg-Souriau vector in kappa-deformed space-time Partha Guha, E. Harikumar and N. S. Zuhair Eur. Phys. J. Plus, 130 10 (2015) 205 Published online: 14 October 2015 DOI: 10.1140/epjp/i2015-15205-3