no. 4
Jacobi fields and regularity of functions of least gradient
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 4, pp. 505-527. 
@article{ASNSP_1984_4_11_4_505_0,
     author = {Parks, Harold R. and Ziemer, William P.},
     title = {Jacobi fields and regularity of functions of least gradient},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {505--527},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 11},
     number = {4},
     year = {1984},
     zbl = {0605.49027},
     mrnumber = {808421},
     language = {en},
     url = {www.numdam.org/item/ASNSP_1984_4_11_4_505_0/}
}
Parks, Harold R.; Ziemer, William P. Jacobi fields and regularity of functions of least gradient. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 4, pp. 505-527. http://www.numdam.org/item/ASNSP_1984_4_11_4_505_0/

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