NANNI, M. Gravitational Differences. Well Beyond The Known "Anomalies" Between Ravenna And Timard. Bollettino della Società Geografica Italiana, [S. l.], p. 1109–1120, 2006. DOI: 10.36253/bsgi-7121. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/7121. Acesso em: 16 oct. 2026.