An Integrated HBIM Simulation Approach for Energy Retrofit of Historical Buildings Implemented in a Case Study of a Medieval Fortress in Italy oleh Cristina Piselli, Jessica Romanelli, Matteo Di Grazia, Augusto Gavagni, Elisa Moretti, Andrea Nicolini, Franco Cotana, Francesco Strangis, Henk J. L. Witte, Anna Laura Pisello