The γ-ray sky seen at X-ray energies - I. Searching for the connection between X-rays and γ-rays in Fermi BL Lac objectsE. J. Marchesini, A. Paggi, F. Massaro, N. Masetti, R. D’Abrusco, I. Andruchow and R. de MenezesA&A, 631 (2019) A150DOI: https://doi.org/10.1051/0004-6361/201936285
