%0 Journal Article %A Sun, Jianzhong %T An equation for the limit state of a superconductor with pinning sites %J Electronic Journal of Differential Equations %D 2005 %V 2005 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a299/ %G en %F EJDE_2005__2005__a299