BibTeX
@ARTICLE{
         Wexler1988AAf,
       AUTHOR = "Wexler, Anthony S.",
       TITLE = "An Algorithm for Exact Evaluation of Multivariate Functions and Their Derivatives to
         Any Order",
       JOURNAL = "Computational Statistics and Data Analysis",
       VOLUME = "6",
       YEAR = "1988",
       PAGES = "1--6",
       REFERRED = "[Tesfatsion1991AEo]."
}