no. 3
A Liouville-type theorem for elliptic systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 3, pp. 387-397 
@article{ASNSP_1994_4_21_3_387_0,
     author = {De Figueiredo, D. G. and Felmer, P. L.},
     title = {A {Liouville-type} theorem for elliptic systems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {387--397},
     year = {1994},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 21},
     number = {3},
     zbl = {0820.35042},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1994_4_21_3_387_0/}
}
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De Figueiredo, D. G.; Felmer, P. L. A Liouville-type theorem for elliptic systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 3, pp. 387-397. https://www.numdam.org/item/ASNSP_1994_4_21_3_387_0/

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