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Research was partially supported by Office of Naval Research, Contract N-00014-67-A0112-0011; National Science Foundation, Grant GP 9329. The second author was also supported by Hydro-Quebec and the University of Montreal.
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Cottle, R.W., Ferland, J.A. On pseudo-convex functions of nonnegative variables. Mathematical Programming 1, 95–101 (1971). https://doi.org/10.1007/BF01584075
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DOI: https://doi.org/10.1007/BF01584075