@phdthesis{Valliappan2018,
  author      = {Senthamizh Pavai Valliappan},
  title       = {Solar Activity Reconstruction from Historical Observations of Sunspots},
  type        = {doctoralthesis},
  pages       = {115},
  school      = {Universit{\"a}t Potsdam},
  year        = {2018},
}