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Corinna Borden Keen Research Fellow at Brown University.
The work of this author was carried out under a grant from the National Science Foundation.
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Akcoglu, M.A., Chacon, R.V. A convexity theorem for positive operators. Z. Wahrscheinlichkeitstheorie verw Gebiete 3, 328–332 (1965). https://doi.org/10.1007/BF00535783
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DOI: https://doi.org/10.1007/BF00535783