Reference:
  Author: >-
    Adolf Mathias and Florian Grond and Ramon Guardans and Detlef
    Seese and Miguel Canela and Hans H. Diebner
  Title: Algorithms for spectral analysis of irregularly sampled time series
  Journal: Journal of Statistical Software
  Year: 2004
  Volume: 11
  Number: 1
  Pages: 1-27
  URL: https://www.jstatsoft.org/article/view/v011i02
  DOI: 10.18637/jss.v011.i02
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