@incollection{pairman:1919:tdt,
    author = {Pairman, Eleanor},
     title = {Tables of Digamma and Trigamma Functions},
 booktitle = {Tracts for Computers, No. 1},
    editor = {Pearson, Karl},
 publisher = {Cambridge Univ. Press},
      year = {1919},
     zblno = {47.0510.15}}