@article{silva_morales_oliveira_2011,  title={Variational data assimilation: mathematical foundations and one application},  volume={26},  ISSN={0102-7786},  url={https://doi.org/10.1590/S0102-77862011000300009},  DOI={10.1590/S0102-77862011000300009},  number={3},  journal={Revista Brasileira de Meteorologia},  publisher={Sociedade Brasileira de Meteorologia},  author={Silva, Paulo S. D. da and Morales, Gudélia and Oliveira, Príscila H. G.},  year={2011},  month={Sep},  pages={433–442} }