@INBOOK{Livre_Rome,
 author = {Auroux, D. and Blum, J. and Ruggiero, G.},
 title = {Data assimilation for geophysical fluids: the {D}iffusive {B}ack and {F}orth {N}udging},
 booktitle = {Mathematical Paradigms of Climate Science},
 series = {INdAM Series},
 publisher = {Springer},
 volume = {15},
 editor = {Ancona, F. and Cannarsa, P. and Jones, C. and Portaluri, A. (Eds.)}
 year = {2016},
 pages = {139--174},
}