Quantum deformations of D=4 Lorentz algebra revisited: twistings of q-deformation A. Borowiec, J. Lukierski and V. N. Tolstoy Eur. Phys. J. C, 57 3 (2008) 601-611 Published online: 26 August 2008 DOI: 10.1140/epjc/s10052-008-0694-3