@ARTICLE{AUROUX-08-NPG,
 author = {Auroux, D. and Blum, J.},
 title = {A nudging-based data assimilation method for oceanographic problems: the Back and Forth Nudging (BFN) algorithm}, 
 journal = {Nonlin. Proc. Geophys.},
 volume = {15},
 year = {2008},
 pages = {305--319},
}