@book{hopf:1934:mpr,
    author = {Hopf, E.},
     title = {Mathematical Problems of Radiative Equilibrium},
    series = {Cambridge Tracts in Mathematics and Mathematical Physics No. 31},
      note = {Reprinted by Stechert-Hafner, Inc., New York, 1964},
 publisher = {Cambridge University Press},
   address = {Cambridge},
      year = {1934},
     pages = {v+104},
   mrclass = {85.00},
  mrnumber = {MR0183517 (32 \#997)},
     zblno = {0009.33004}}