no. 2
Regularity at the free boundary of two-dimensional stationary harmonic maps
Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 2, pp. 151-167 
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     author = {Gr\"uter, Michael},
     title = {Regularity at the free boundary of two-dimensional stationary harmonic maps},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {151--167},
     year = {1998},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {2},
     mrnumber = {1614642},
     zbl = {0910.49021},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1998__15_2_151_0/}
}
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Grüter, Michael. Regularity at the free boundary of two-dimensional stationary harmonic maps. Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 2, pp. 151-167. https://www.numdam.org/item/AIHPC_1998__15_2_151_0/

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