The existence of nonminimal regular harmonic maps from B 3 to S 2
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 16 (1989) no. 3, p. 355-365 
@article{ASNSP_1989_4_16_3_355_0,
     author = {Zhang, Dong},
     title = {The existence of nonminimal regular harmonic maps from $B^3$ to $S^2$},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 16},
     number = {3},
     year = {1989},
     pages = {355-365},
     zbl = {0701.58017},
     mrnumber = {1050331},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1989_4_16_3_355_0}
}

Zhang, Dong. The existence of nonminimal regular harmonic maps from $B^3$ to $S^2$. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 16 (1989) no. 3, pp. 355-365. http://www.numdam.org/item/ASNSP_1989_4_16_3_355_0/

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