no. 4
Elliptic and degenerate-elliptic operators in unbounded domains
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 27 (1973) no. 4, pp. 591-640. 
@article{ASNSP_1973_3_27_4_591_0,
     author = {Edmunds, D. E. and Evans, W. D.},
     title = {Elliptic and degenerate-elliptic operators in unbounded domains},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {591--640},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 27},
     number = {4},
     year = {1973},
     zbl = {0298.35027},
     mrnumber = {380094},
     language = {en},
     url = {www.numdam.org/item/ASNSP_1973_3_27_4_591_0/}
}
Edmunds, D. E.; Evans, W. D. Elliptic and degenerate-elliptic operators in unbounded domains. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 27 (1973) no. 4, pp. 591-640. http://www.numdam.org/item/ASNSP_1973_3_27_4_591_0/

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