Talone, M., M. Meloni, J. L. Pelegri, M. Rosell-Fieschi, and R. Flobergaghen. “Evolution of Geoids in Recent Years and Its Impact on Oceanography”. Scientia Marina, vol. 78, no. 2, June 2014, pp. 155-64, doi:10.3989/scimar.03824.30A.