@INPROCEEDINGS{WAVES13,
 title = {Data assimilation: variational methods and back and forth nudging algorithm, application to thermoacoustic tomography},
 author = {Auroux, D. and Blum, J. and Marinesque, S.},
 booktitle = {Proc. 11th Int. Conf. Mathematical and Numerical Aspects of Waves},
 pages = {69-80},
 year = {2013},
 }