Giovannini, E. N. “‘A Picture of Geometrical Reality’: Hilbert’s Axiomatic Conception of Geometry in the Light of Heinrich Hertz’s Bildtheorie”. Crítica. Revista Hispanoamericana De Filosofía, vol. 44, no. 131, Dec. 2018, pp. 27-53, doi:10.22201/iifs.18704905e.2012.762.