@misc{75344,
  author = {A.R. Lawrence and Martin Leutbecher and T.N. Palmer},
  title = {Comparison of Total Energy and Hessian Singular Vectors: Implications for Observation Targeting NOT PUBLISHED},
  year = {2007},
  journal = {ECMWF Technical Memoranda},
  number = {517},
  month = {2007},
  publisher = {ECMWF},
  url = {https://www.ecmwf.int/node/10665},
  doi = {10.21957/htk9s246},
  language = {eng},
}