@article{okamoto:1981:tpe,
    author = {Okamoto, Kazuo},
     title = {On the {$\tau $}-function of the {P}ainlev\'e equations},
   journal = {Phys. D},
  fjournal = {Physica D. Nonlinear Phenomena},
    volume = {2},
      year = {1981},
    number = {3},
     pages = {525–535},
      issn = {0167-2789},
     coden = {PHYSA},
   mrclass = {34A20 (58A17 58F18)},
  mrnumber = {MR0625451 (82i:34005)},
mrreviewer = {D. A. Lutz},
       doi = {10.1016/0167-2789(81)90026-9}}