@inbook{8631,
  author = {J. Huovelin and S. Saar and I. Tuominen and S. Linnaluoto and H. Virtanen},
  title = {Broadband linear polarization and chromospheric CA II H and K emission in late-type main sequence stars},
  year = {1987},
  volume = {291},
  number = {Lecture Notes in Physics},
  pages = {41-43},
  publisher = {Springer Berlin Heidelberg},
  address = {Berlin, Heidelberg},
  isbn = {978-3-540-18653-3},
  doi = {10.1007/3-540-18653-0_103},
}