A Tutorial on O-RAN Deployment Solutions for 5G: From Simulation to Emulated and Real Testbeds - Luis Herrera, J.; Montebugnoli, S.; Scotece, D.; Foschini, L.; Bellavista, P. (IEEE Communications Surveys & Tutorials, Communications Surveys & Tutorials, IEEE, IEEE Commun. Surv. Tutorials, 2026)