@article{ArltValliappanSchmieletal.2016,
  author    = {Rainer Arlt and Senthamizh Pavai Valliappan and C. Schmiel and F. Spada},
  title     = {Sunspot positions, areas, and group tilt angles for 1611-1631 from observations by Christoph Scheiner},
  journal   = {Mountain research and development},
  volume    = {595},
  doi       = {10.1051/0004-6361/201629000},
  year      = {2016},
}