@ARTICLE{schuh_03c,
  author = {Schuh, W.-D.},
  title = {The processing of band-limited measurements; filtering techniques
	in the least squares context and in the presence of data gaps},
  journal = {Space Science Reviews},
  year = {2003},
  volume = {108},
  pages = {67--78},
  number = {1-2},
  booktitle = {Earth Gravity Field from Space - From Sensors to Earth Sciences},
  doi = {10.1023/A:1026121814042},
  editor = {Beutler, G. and M.R. Drinkwater and R. Rummel and R. von Steiger},
  keywords = {least squares, band-limited observations, decorrelation, filtering,
	whitening process },
  publisher = {Space Science Reviews}
}