@book{lehto:1973:qmp,
    author = {Lehto, O. and Virtanen, K. I.},
     title = {Quasiconformal Mappings in the Plane},
   edition = {2nd},
      note = {Translated from the German by K. W. Lucas,
              Die Grundlehren der mathematischen Wissenschaften, Band 126},
 publisher = {Springer-Verlag},
   address = {New York},
      year = {1973},
     pages = {viii+258},
   mrclass = {30A60},
  mrnumber = {MR0344463 (49 \#9202)},
     zblno = {0267.30016}}