@article{hardy:1925:spp,
    author = {Hardy, G. H. and Littlewood, J. E.},
     title = {Some problems of ``{P}artitio Numerorum'' ({VI}): Further researches
              in {W}aring's {P}roblem},
   journal = {Math. Z.},
  fjournal = {Mathematische Zeitschrift},
    volume = {23},
      year = {1925},
     pages = {1–37},
      note = {Reprinted in Collected Papers of {G}. {H}. {H}ardy ({I}ncluding
             {J}oint papers with {J}. {E}. {L}ittlewood and others), {V}ol. {I},
             pp. 469–505, Clarendon Press, Oxford, 1966.},
      issn = {0025-5874},
  mrnumber = {1544728},
       doi = {10.1007/BF01506218},
     zblno = {51.0148.01}}