Revised optical classification of a sample of gamma-ray-emitting active galactic nuclei with GTC and VLT. - Dalla Barba, B.; Foschini, L.; Berton, M.; Järvelä, E.; Marziani, P.; Ciroi, S.; Dalla Bontá, E.; Crepaldi, L.; Vietri, A.; Antón, S.; Marchã, M. J. M.; Condó, P.; et al. (Astronomy & Astrophysics / Astronomie et Astrophysique, 2026)