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Books about Gerbaldi:
Scritti Matematici offerti Ad Enrico D'Ovidio in Occasione Del Suo Lxxv Genetliaco, 11 Agosto 1918 ... E Pubblicati... by Francesco Gerbaldi (Sep 13, 2006)
Wiki information Gerbaldi:
Francesco Gerbaldi was an Italian geometer, who proved Gerbaldi's theorem.
In linear algebra and projective geometry, Gerbaldi's theorem, proved by Gerbaldi, states that one can find six pairwise apolar linearly independent nondegenerate ternary quadratic forms. These are permuted by the Valentiner group.