Average hard X-ray emission from NS LMXBs: observational evidence of different spectral states in NS LMXBs
A. Paizis, R. Farinelli, L. Titarchuk, T. J.-L. Courvoisier, A. Bazzano, V. Beckmann, F. Frontera, P. Goldoni, E. Kuulkers, S. Mereghetti, J. Rodriguez and O. Vilhu
