Algebraic and topological selections of multi-valued linear relations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 111-126. 
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Lee, Sung J.; Nashed, M. Zuhair. Algebraic and topological selections of multi-valued linear relations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 111-126. http://archive.numdam.org/item/ASNSP_1990_4_17_1_111_0/

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