Accurate classification of 75 counterparts of objects detected in the 54-month Palermo Swift/BAT hard X-ray catalogue
P. Parisi, N. Masetti, A. F. Rojas, E. Jiménez-Bailón, V. Chavushyan, E. Palazzi, L. Bassani, A. Bazzano, A. J. Bird, G. Galaz, D. Minniti, L. Morelli and P. Ubertini
