Minimum Cost Design of Cellular Networks in Rural Areas With UAVs, Optical Rings, Solar Panels, and Batteries. - Luca Chiaraviglio; Lavinia Amorosi; Nicola Blefari-Melazzi; Paolo Dell'Olmo; Antonio Lo Mastro; Carlos Natalino; Paolo Monti 001 (IEEE Trans. Green Commun. Netw., 2019)