1. D. R. Adams, A note on Riesz potentials, DukeMath. J. 42 (1975), 765–778.
2. F. Bethuel, Un résultat de régularité pour les solutions de l’équation de surfaces à courbure moyenne prescrite, (French) “A regularity result for solutions to the equation of surfaces of prescribed mean curvature” C. R. Acad. Sci. Paris Sér. I Math. 314 (1992), 1003–1007.
3. F. Bethuel, On the singular set of stationary harmonic maps, Manuscripta Math. 78 (1993), 417–443.
4. P. Choné, A regularity result for critical points of conformally invariant functionals, Potential Anal. 4 (1995), 269–296.
5. R. R. Coifman, P.-L. Lions, Y. Meyer and S. Semmes, Compensated compactness and Hardy spaces, J. Math. Pures Appl. (9) 72 (1993), 247–286.