no. 3-4
Harmonic maps on planar lattices
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 25 (1997) no. 3-4, pp. 713-730. 
@article{ASNSP_1997_4_25_3-4_713_0,
     author = {M\"uller, Stefan and Struwe, Michael and \v{S}ver\'ak, Vladimir},
     title = {Harmonic maps on planar lattices},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {713--730},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 25},
     number = {3-4},
     year = {1997},
     mrnumber = {1655538},
     zbl = {1004.58007},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1997_4_25_3-4_713_0/}
}
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Müller, Stefan; Struwe, Michael; Šverák, Vladimir. Harmonic maps on planar lattices. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 25 (1997) no. 3-4, pp. 713-730. http://www.numdam.org/item/ASNSP_1997_4_25_3-4_713_0/

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