Increasing Hazard Rate of Mixtures for Natural Exponential Families. Bar-Lev, S. K. & Letac, G. Advances in Applied Probability, 44(2):373–390, June, 2012.
Increasing Hazard Rate of Mixtures for Natural Exponential Families [link]Paper  doi  bibtex   
@Article{Bar-Lev:2012:IHR,
  author =       "Shaul K. Bar-Lev and G{\'e}rard Letac",
  title =        "Increasing Hazard Rate of Mixtures for Natural
                 Exponential Families",
  journal =      j-ADV-APPL-PROB,
  volume =       "44",
  number =       "2",
  pages =        "373--390",
  month =        jun,
  year =         "2012",
  CODEN =        "AAPBBD",
  DOI =          "https://doi.org/10.2307/41714055",
  ISSN =         "0001-8678 (print), 1475-6064 (electronic)",
  ISSN-L =       "0001-8678",
  bibdate =      "Sat May 3 07:43:15 MDT 2014",
  bibsource =    "http://www.jstor.org/stable/i40080512;
                 http://www.math.utah.edu/pub/tex/bib/advapplprob.bib",
  URL =          "http://www.jstor.org/stable/41714055",
  acknowledgement = ack-nhfb,
  ajournal =     "Adv. Appl. Probab.",
  fjournal =     "Advances in Applied Probability",
  journal-URL =  "http://www.jstor.org/journals/00018678.html",
}

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