@article{rowbatham,
author={Rowbotham, Peter S. and  Pratt, R.    G.},
year={1997},
title={Improved inversion through use of the null space},
journal={Geophysics},
volume={62},
number={3},
pages={869-883}}

@article{helix,
author={Claerbout, Jon F.},
year={1998},
title={Multi-dimensional recursive filtering via the helix},
journal={Geophysics},
volume={63},
number={5},
pages={1532-1541}}


@article{jun,
author={Ji, Jun},
year={1997},
title={Tomographic velocity estimation with plane-wave synthesis},
journal={Geophysics},
volume={62},
number={6},
pages={1825-1838}}


@article{error,
author={Delprat-Jannaud, F. and Lailly, P.},
year={1992},
title={What information on the earth model do reflection travel times provide?},
journal={J. Geophysical Research},
volume={97},
pages={19827-19844}}



@Book{geostat,
  author =   {Issaks, Edward H. and Srivastava, R. M.},
  title = {An {I}ntroduction to {A}pplied {G}eostatistics},
  publisher =    {Oxford University Press},
  year =   1989
}



@Book{pvi,
  author =   {Jon F. Claerbout},
  title = {{E}arth {S}oundings {A}nalysis: {P}rocessing versus {I}nversion},
  publisher =    {Blackwell Scientific Publications},
  year =   1992
}



@Booklet{gee,
  title =    {{G}eophysical {E}stimation by {E}xample: {E}nvironmental soundings
 image enhancement},
  author =   {J. Claerbout},
  howpublished = {http://sepwww.stanford.edu/sep/prof/},
  year =   1998
}


@inproceedings{SEG.1994.1406,
author={Rekdal, Thorbjorn and  Biondi, Biondo},
year={1994},
title={Paraxial ray tracing in the Marmousi model},
booktitle={64th Annual Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts},
publisher={},
volume={94},
pages={1406-1409},
keywords={imaging; modeling; prestack; ray tracing; traveltime}}


@article{GEO61.05.15111523,
author={Kosloff, D. and  Sherwood, J. and  Koren, Z. and  Machet, E. and  Falkovitz, Y.},
year={1996},
title={Velocity and interface depth determination by tomography of depth migrated gathers},
journal={61},
volume={5},
number={1511-1523}}


@inbook{TME00-00-00010194,
author={Versteeg, R. and  Grau, G.},
year={1990},
title={Practical aspects of seismic data inversion, The Marmousi experience *},
editor={Versteeg, R.; Grau, G.},
booktitle={Proceedings of 1990 EAEG Workshop, 52nd EAEG Meeting},
city={Copenhagen},
publisher={Eur. Assoc. Expl. Geophys.},
pages={1-194},
keywords={structural imaging; migration; case history},
notes={Eight comparisons of inversion techniques}}


@Booklet{fgdp,  title =    {Fundamentals of {G}eophysical {D}ata {P}rocessing},
  author =   {J. Claerbout},
  howpublished = {http://sepwww.stanford.edu/sep/prof/},  year =   1976
}

@article{GEO62-03-09700979,
author={Al-Chalabi, M.},
year={1997},
title={Parameter nonuniqueness in velocity versus depth functions},
journal={Geophysics},
volume={62},
number={03},
pages={970-979}}


@article{GEO51-10-18931903,
author={Tarantola, A.},
year={1986},
title={A strategy for nonlinear elastic inversion of seismic reflection data},
journal={Geophysics},
volume={51},
number={10},
pages={1893-1903}}