On the existence of harmonic maps from a surface into the real projective plane
Compositio Mathematica, Tome 59 (1986) no. 1, pp. 15-19. 
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     author = {Jost, J\"urgen},
     title = {On the existence of harmonic maps from a surface into the real projective plane},
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     publisher = {Martinus Nijhoff Publishers},
     volume = {59},
     number = {1},
     year = {1986},
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     zbl = {0601.58026},
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     url = {http://archive.numdam.org/item/CM_1986__59_1_15_0/}
}
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Jost, Jürgen. On the existence of harmonic maps from a surface into the real projective plane. Compositio Mathematica, Tome 59 (1986) no. 1, pp. 15-19. http://archive.numdam.org/item/CM_1986__59_1_15_0/

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