@phdthesis{74881,
  author = {I. Holmstrom},
  title = {On empirical orthogonal functions and variational methods},
  year = {1977},
  journal = {Workshop on the use of Empirical Orthogonal functions in Meteorology},
  pages = {8-20},
  month = {1977},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}