@article{7474,
  author = {S. Sofia and Ludwig Oster and K. Schatten},
  title = {Solar irradiance modulation by active regions during 1980},
  year = {1982},
  journal = {Solar Physics},
  volume = {80},
  pages = {87-98},
  month = {Jan-09-1982},
  issn = {0038-0938},
  doi = {10.1007/BF00153425},
}