This happened in the early 1960s, in independent work of Klaus Roth and Enrico Bombieri.
Enrico Caruso | Enrico Fermi | Enrico Ferri | Enrico Macias | Enrico Baj | Enrico Cialdini | Enrico Castellani | Robert Enrico | Enrico David | Enrico Dandolo | Enrico Corradini | Enrico Bombieri | Enrico Berlinguer | Italian submarine Enrico Tazzoli | Enrico Ruggeri | Enrico Pieranunzi | Enrico Mattei | Enrico Marconi | Enrico Fabris | Enrico Alfano | Seventeenth-century Spanish painting commemorating Enrico's defeat at San Juan de Puerto Rico; by Eugenio Caxés | Roger Enrico | Enrico Toselli | Enrico Tellini | Enrico Sertoli | Enrico Salati | Enrico Mosconi | Enrico Lo Verso | Enrico Golisciani | Enrico Giovannini |
One of the most famous results of Giusti, is the one obtained with Enrico Bombieri and Ennio De Giorgi, concerning the minimality of Simons' cones, and allowing to disprove the validity of Bernstein's theorem in dimension larger than 8.