@article{RO_2009__43_3_309_0,
     author = {Sainvitu, Caroline},
     title = {How much do approximate derivatives hurt filter methods ?},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {309--329},
     publisher = {EDP-Sciences},
     volume = {43},
     number = {3},
     year = {2009},
     doi = {10.1051/ro/2009016},
     mrnumber = {2567991},
     zbl = {1175.65074},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro/2009016/}
}