1. ALEXANDROV, A. D. (1958), Konvexe Polyeder, Berlin.
2. BALL, W. W. R. (1949), Mathematical Recreations and Essays (11th edition), London.
3. On Lattice Covering by Spheres;BAMBAH;Proc. Nat. Inst. Sci. India,1954
4. Covering the Plane with Convex Sets;BAMBAH;J. London Math. Soc.,1952
5. The Covering of Space by Spheres;BARNES;Canadian J. Math.,1956