On abelian subvarieties generated by symmetric correspondences. G.P. Pirola; A. Alzati — 1990 Mathematische Zeitschrift
Some density results for curves with non-simple jacobians. E. Colombo; G.P. Pirola — 1990 Mathematische Annalen
A remark about minimal surfaces with flat embedded ends. Pirola, G.P. — 1999 Rendiconti del Seminario Matematico
Density of elliptic solitons. E. Colombo; Pirola G.P.; E. Previato — 1994 Journal für die reine und angewandte Mathematik