no. 2
Harmonic diffeomorphisms, minimizing harmonic maps and rotational symmetry
Compositio Mathematica, Tome 69 (1989) no. 2, pp. 175-228. 
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     title = {Harmonic diffeomorphisms, minimizing harmonic maps and rotational symmetry},
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     pages = {175--228},
     publisher = {Kluwer Academic Publishers},
     volume = {69},
     number = {2},
     year = {1989},
     mrnumber = {984634},
     zbl = {0686.58012},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1989__69_2_175_0/}
}
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Coron, J. M.; Helein, F. Harmonic diffeomorphisms, minimizing harmonic maps and rotational symmetry. Compositio Mathematica, Tome 69 (1989) no. 2, pp. 175-228. http://archive.numdam.org/item/CM_1989__69_2_175_0/

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