@inbook{6150,
  author = {N. Weiss and S. Tobias},
  title = {Modulation of solar and stellar activity cycles},
  year = {1997},
  volume = {489},
  number = {Lecture Notes in Physics},
  pages = {25-47},
  publisher = {Springer Berlin Heidelberg},
  isbn = {978-3-540-63072-2},
  doi = {10.1007/BFb0105669},
}