References
- WHITNEY , H . 1932 . Proc. Nat. Acad. Sci , 18 : 275 – 278 .
- NADLER , S . 1978 . Hyperspaces of Sets , New York and Basel : Marcel Dekker .
- LAY , S. R . 1992 . Convex Sets and their Application , Malabur, FL : Krieger .
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