The populations of hard X-ray and γ-ray sources: a correlation study and new possible identificationsA. Maselli, G. Cusumano, E. Massaro, A. Segreto, V. La Parola, A. Tramacere and I. DonnarummaA&A, 531 (2011) A153DOI: https://doi.org/10.1051/0004-6361/201116916