1. Yu. D. Burago, A problem on Jung's circle for a sphere (Russian),Matematicheskoye Prosveshchenie Moscow,6 (1961), 165–170.
2. L. Danzer, B. Grünbaum and V. Klee, Helly's Theorem and its relatives, inProceedings of Symposia in Pure Mathematics, Volume VII, Convexity, AMS (Providence, R.I., 1963).
3. B. V. Dekster, An extension of Jung's Theorem,Israel Journal of Math.,50 (1985), 169–180.
4. B. V. Dekster, Bodies of constant width in Riemannian manifolds and spaces of constant curvature.DIMACS Series in Discrete Math. and Theoretical Computer Sci.,4 (1991), Applied Geometry and Discrete Math., The Victor Klee Festschrift, 181–192.
5. B. V. Dekster and J. B. Wilker, Simplexes in spaces of constant curvature,Geometriae Dedicata,38 (1991), 1–12.