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BibTeX entry

@Article{Pegoraro:2011:ECV,
  author =       "Vincent Pegoraro and Philipp Slusallek",
  title =        "On the Evaluation of the Complex-Valued Exponential
                 Integral",
  journal =      j-J-GRAPHICS-GPU-GAME-TOOLS,
  volume =       "15",
  number =       "3",
  pages =        "183--198",
  year =         "2011",
  CODEN =        "????",
  DOI =          "https://doi.org/10.1080/2151237X.2011.617177",
  ISSN =         "2151-2272 (print), 2151-237X (electronic)",
  ISSN-L =       "2151-2272",
  bibdate =      "Wed Dec 14 10:31:39 MST 2011",
  bibsource =    "http://www.math.utah.edu/pub/tex/bib/elefunt.bib;
                 http://www.math.utah.edu/pub/tex/bib/jgraphtools.bib",
  abstract =     "Although its applications span a broad scope of
                 scientific fields ranging from applied physics to
                 computer graphics, the exponential integral is a
                 nonelementary special function available in specialized
                 software packages but not in standard libraries,
                 consequently requiring custom implementations on most
                 platforms. In this paper, we provide a concise and
                 comprehensive description of how to evaluate the
                 complex-valued exponential integral. We first introduce
                 some theoretical background on the main characteristics
                 of the function, and outline available third-party
                 proprietary implementations. We then provide an
                 analysis of the various known representations of the
                 function and present an effective algorithm allowing
                 the computation of results within a desired accuracy,
                 together with the corresponding pseudocode in order to
                 facilitate portability onto various systems. An
                 application to the calculation of the closed-form
                 solution to single light scattering in homogeneous
                 participating media illustrates the practical benefits
                 of the provided implementation with the hope that, in
                 the long term, the latter will contribute to
                 standardizing the availability of the complex-valued
                 exponential integral on graphics platforms.",
  acknowledgement = ack-nhfb,
  journal-URL =  "http://www.tandfonline.com/loi/ujgt20",
  onlinedate =   "21 Oct 2011",
}

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