@article{witten:1987:egq,
    author = {Witten, Edward},
     title = {Elliptic genera and quantum field theory},
   journal = {Comm. Math. Phys.},
  fjournal = {Communications in Mathematical Physics},
    volume = {109},
      year = {1987},
    number = {4},
     pages = {525–536},
      issn = {0010-3616},
     coden = {CMPHAY},
   mrclass = {57R90 (11F11 55N20 58G05 58G10)},
  mrnumber = {MR885560 (89i:57017)},
mrreviewer = {J. Stasheff},
 euclid_id = {euclid.cmp/1104117076},
       doi = {10.1007/BF01208956},
     zblno = {0625.57008}}