Model independent result on possible diurnal effect in DAMA/LIBRA-phase1 R. Bernabei, P. Belli, F. Cappella, V. Caracciolo, S. Castellano, R. Cerulli, C. J. Dai, A. d’Angelo, S. d’Angelo, A. Di Marco et al. (9 more) Eur. Phys. J. C, 74 3 (2014) 2827 Published online: 27 March 2014 DOI: 10.1140/epjc/s10052-014-2827-1