A compactness theorem of $n$-harmonic maps

For $n\ge 3$, let $Ω$ be a bounded domain in $R^n$ and $N$ be a compact Riemannian manifold in $R^L$ without boundary. Suppose that $u_n\in W^{1,n}(Ω,N)$ are the Palais-Smale sequences of the Dirichlet $n$-energy functional and $u_n$ converges weakly in $W^{1,n}$ to a map $u\in W^{1,n}(Ω,N)$. Then $u$ is a $n$-harmonic map. In particular, the space of $n$-harmonic maps is sequentially compact for the weak $W^{1,n}$-topology.

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