no. 3
Vacuum solutions of a stationary drift-diffusion model
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 371-386. 
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     author = {Markowich, P. A. and Unterreiter, A.},
     title = {Vacuum solutions of a stationary drift-diffusion model},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {371--386},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {3},
     year = {1993},
     mrnumber = {1256074},
     zbl = {0808.35152},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1993_4_20_3_371_0/}
}
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Markowich, P. A.; Unterreiter, A. Vacuum solutions of a stationary drift-diffusion model. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 371-386. http://archive.numdam.org/item/ASNSP_1993_4_20_3_371_0/

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