@article{4428,
      author       = "Vahala, M. E. and National Board of Survey Finland and 9.
                      mezinár. konf. kart.,Rockville,Md. 1978",
      title        = "Computer assisted cartography in basic map production (1:20
                      000)  ",
      year         = "1978",
      note         = "1 seš.",
}