1. BERGE, C.-Espaces topologiques. Fonctions multivoques. Dunod (1959).
2. BOURBAKI, N.-Topologie générale. Hermann. There are a lot of exercises about topology on spaces of subsets: Ch. I: § 2, ex. 7; § 3, ex. 10, 16; § 5, ex. 7; § 8, ex. 12, 29; § 9, ex. 13, 14; § 10, ex. 20; § 11, ex. 18, 24;-Ch. II: § 1, ex. 5; § 2, ex. 6; § 3, ex. 7; § 4, ex. 11, 15;-Ch. IX: § 2, ex. 6, 21;-Ch. X: § 1, ex. 7-See also Espaces vectoriels topologiques-Ch. II, § 2, ex. 39.
3. CHOQUET, G.-Convergences. Ann. Univ. Grenoble 23 (1947), 55–112.
4. DEBREU, G.-Integration of correspondences. 5th Berkeley Symposium on Math. Stat. Prob. Vol. II, part. I, p. 351–372.
5. GODET-THOBIE, C.-PHAM THE LAI — Sur le plongement de l'ensemble des convexes fermés bornés d'un espace vectoriel topologique localement convexe dans un espace vectoriel topologique localement convexe. Comptes Rendus Ac. Sc. Paris 271 (1970), 84–87.