The existence of Ginzburg-Landau solutions on the plane by a direct variational method Yisong Yang — 1994 Annales de l'I.H.P. Analyse non linéaire
Topological solutions in the self-dual Chern-Simons theory : existence and approximation Joel Spruck; Yisong Yang — 1995 Annales de l'I.H.P. Analyse non linéaire