@article{krichever:1989:faa,
    author = {Krichever, Igor Moiseevich and Novikov, S. P.},
     title = {Algebras of {V}irasoro type, the energy-momentum tensor, and
              operator expansions on {R}iemann surfaces},
   journal = {Funktsional. Anal. i Prilozhen.},
  fjournal = {Akademiya Nauk SSSR. Funktsional' ny\u\i\ Analiz i ego
              Prilozheniya},
    volume = {23},
      year = {1989},
    number = {1},
     pages = {24–40},
      note = {In Russian. English translation: Funct. Anal. Appl.
              {\bf{23}}(1989), no. 1, pp. 19–33},
  language = {Russian},
      issn = {0374-1990},
   mrclass = {17B65 (58F40 81D15 81E30)},
  mrnumber = {MR0998426 (90k:17049)},
mrreviewer = {Fedor Malikov},
       doi = {10.1007/BF01078570},
     zblno = {0684.17012}}