@article{21647,
      author       = "Stenmark, L.",
      title        = "Optisk lägesgivare  ",
      year         = "1981",
      note         = "1 sv., G 01 B 11/03, G 01 C 5/00, G 01 B 11/26., 21.1.1980,
                      17.3.1980",
}