@article{apostol:1983:pem,
    author = {Apostol, Tom M.},
     title = {A proof that {E}uler missed: Evaluating {$\RiemannZeta (2)$}
              the easy way},
   journal = {Math. Intelligencer},
  fjournal = {The Mathematical Intelligencer},
    volume = {5},
      year = {1983},
    number = {3},
     pages = {59–60},
      issn = {0343-6993},
     coden = {MAINDC},
   mrclass = {11M06},
  mrnumber = {MR0737691 (86b:11054)},
mrreviewer = {P. Sz{\"u}sz},
     zblno = {0538.10001}}