@book{springer:1957:irs,
    author = {Springer, George},
     title = {Introduction to {R}iemann Surfaces},
 publisher = {Addison-Wesley Publishing Company},
   address = {Reading, Massachusetts},
      year = {1957},
     pages = {viii+307},
   mrclass = {30.0X},
  mrnumber = {MR0092855 (19,1169g)},
mrreviewer = {L. Sario},
     zblno = {0078.06602},
zblreviewer = {H.~Wittich},
      note = {A second edition was published in 1981 (Chelsea Publishing Co., New York, and
              AMS Chelsea Book Series, American Mathematical Society, Providence, Rhode Island)}}