Geodesic
When $(E,\sigma (E,E'))$ is a $DF$-space?
Commentationes Mathematicae Universitatis Carolinae, Tome 33 (1992) no. 1, pp. 43-44.

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Let $(E,t)$ be a Hausdorff locally convex space. Either $(E,\sigma (E,E'))$ or \newline $(E',\sigma (E',E))$ is a $DF$-space iff $E$ is of finite dimension (THEOREM). This is the most general solution of the problem studied by Iyahen [2] and Radenovič [3].
Classification : 46A03, 46A04, 46A05, 46A20
Keywords: $DF$-spaces; countably quasibarrelled spaces 
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Krassowska, Dorota; Śliwa, Wiesƚaw. When $(E,\sigma (E,E'))$ is a $DF$-space?. Commentationes Mathematicae Universitatis Carolinae, Tome 33 (1992) no. 1, pp. 43-44. http://geodesic.mathdoc.fr/item/CMUC_1992__33_1_a4/