no. 3
S k -valued maps minimizing the L p norm of the gradient with free discontinuities
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 18 (1991) no. 3, pp. 321-352 
@article{ASNSP_1991_4_18_3_321_0,
     author = {Carriero, M. and Leaci, A.},
     title = {$S^k$-valued maps minimizing the $L^p$ norm of the gradient with free discontinuities},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {321--352},
     year = {1991},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 18},
     number = {3},
     mrnumber = {1145314},
     zbl = {0753.49018},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1991_4_18_3_321_0/}
}
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Carriero, M.; Leaci, A. $S^k$-valued maps minimizing the $L^p$ norm of the gradient with free discontinuities. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 18 (1991) no. 3, pp. 321-352. https://www.numdam.org/item/ASNSP_1991_4_18_3_321_0/

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