@article{hartree:1936:spa,
    author = {Hartree, D. R.},
     title = {Some properties and applications of the repeated integrals
              of the error function},
   journal = {Proc. Manchester Lit. Philos. Soc.},
      year = {1936},
    volume = {80},
     pages = {85–102},
     zblno = {62.1244.01}}