@inbook{8616,
  author = {F. Walter and C. Schrijver},
  title = {Activity in warm stars},
  year = {1987},
  volume = {291},
  number = {Lecture Notes in Physics},
  pages = {262-264},
  publisher = {Springer Berlin Heidelberg},
  address = {Berlin, Heidelberg},
  isbn = {978-3-540-18653-3},
  doi = {10.1007/3-540-18653-0_141},
}